{
  "abi": [],
  "allSourcePaths": {
    "107": "node_modules/@openzeppelin/contracts/utils/Strings.sol"
  },
  "ast": {
    "absolutePath": "node_modules/@openzeppelin/contracts/utils/Strings.sol",
    "exportedSymbols": {
      "Strings": [
        26767
      ]
    },
    "id": 26768,
    "license": "MIT",
    "nodeType": "SourceUnit",
    "nodes": [
      {
        "id": 26566,
        "literals": [
          "solidity",
          "^",
          "0.8",
          ".0"
        ],
        "nodeType": "PragmaDirective",
        "src": "86:23:107"
      },
      {
        "abstract": false,
        "baseContracts": [],
        "contractDependencies": [],
        "contractKind": "library",
        "documentation": {
          "id": 26567,
          "nodeType": "StructuredDocumentation",
          "src": "111:34:107",
          "text": " @dev String operations."
        },
        "fullyImplemented": true,
        "id": 26767,
        "linearizedBaseContracts": [
          26767
        ],
        "name": "Strings",
        "nameLocation": "154:7:107",
        "nodeType": "ContractDefinition",
        "nodes": [
          {
            "constant": true,
            "id": 26570,
            "mutability": "constant",
            "name": "_HEX_SYMBOLS",
            "nameLocation": "193:12:107",
            "nodeType": "VariableDeclaration",
            "scope": 26767,
            "src": "168:58:107",
            "stateVariable": true,
            "storageLocation": "default",
            "typeDescriptions": {
              "typeIdentifier": "t_bytes16",
              "typeString": "bytes16"
            },
            "typeName": {
              "id": 26568,
              "name": "bytes16",
              "nodeType": "ElementaryTypeName",
              "src": "168:7:107",
              "typeDescriptions": {
                "typeIdentifier": "t_bytes16",
                "typeString": "bytes16"
              }
            },
            "value": {
              "hexValue": "30313233343536373839616263646566",
              "id": 26569,
              "isConstant": false,
              "isLValue": false,
              "isPure": true,
              "kind": "string",
              "lValueRequested": false,
              "nodeType": "Literal",
              "src": "208:18:107",
              "typeDescriptions": {
                "typeIdentifier": "t_stringliteral_cb29997ed99ead0db59ce4d12b7d3723198c827273e5796737c926d78019c39f",
                "typeString": "literal_string \"0123456789abcdef\""
              },
              "value": "0123456789abcdef"
            },
            "visibility": "private"
          },
          {
            "body": {
              "id": 26648,
              "nodeType": "Block",
              "src": "399:632:107",
              "statements": [
                {
                  "condition": {
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 26580,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "id": 26578,
                      "name": "value",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 26573,
                      "src": "601:5:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "==",
                    "rightExpression": {
                      "hexValue": "30",
                      "id": 26579,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "number",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "610:1:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_rational_0_by_1",
                        "typeString": "int_const 0"
                      },
                      "value": "0"
                    },
                    "src": "601:10:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bool",
                      "typeString": "bool"
                    }
                  },
                  "id": 26584,
                  "nodeType": "IfStatement",
                  "src": "597:51:107",
                  "trueBody": {
                    "id": 26583,
                    "nodeType": "Block",
                    "src": "613:35:107",
                    "statements": [
                      {
                        "expression": {
                          "hexValue": "30",
                          "id": 26581,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": true,
                          "kind": "string",
                          "lValueRequested": false,
                          "nodeType": "Literal",
                          "src": "634:3:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_stringliteral_044852b2a670ade5407e78fb2863c51de9fcb96542a07186fe3aeda6bb8a116d",
                            "typeString": "literal_string \"0\""
                          },
                          "value": "0"
                        },
                        "functionReturnParameters": 26577,
                        "id": 26582,
                        "nodeType": "Return",
                        "src": "627:10:107"
                      }
                    ]
                  }
                },
                {
                  "assignments": [
                    26586
                  ],
                  "declarations": [
                    {
                      "constant": false,
                      "id": 26586,
                      "mutability": "mutable",
                      "name": "temp",
                      "nameLocation": "665:4:107",
                      "nodeType": "VariableDeclaration",
                      "scope": 26648,
                      "src": "657:12:107",
                      "stateVariable": false,
                      "storageLocation": "default",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "typeName": {
                        "id": 26585,
                        "name": "uint256",
                        "nodeType": "ElementaryTypeName",
                        "src": "657:7:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "visibility": "internal"
                    }
                  ],
                  "id": 26588,
                  "initialValue": {
                    "id": 26587,
                    "name": "value",
                    "nodeType": "Identifier",
                    "overloadedDeclarations": [],
                    "referencedDeclaration": 26573,
                    "src": "672:5:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "nodeType": "VariableDeclarationStatement",
                  "src": "657:20:107"
                },
                {
                  "assignments": [
                    26590
                  ],
                  "declarations": [
                    {
                      "constant": false,
                      "id": 26590,
                      "mutability": "mutable",
                      "name": "digits",
                      "nameLocation": "695:6:107",
                      "nodeType": "VariableDeclaration",
                      "scope": 26648,
                      "src": "687:14:107",
                      "stateVariable": false,
                      "storageLocation": "default",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "typeName": {
                        "id": 26589,
                        "name": "uint256",
                        "nodeType": "ElementaryTypeName",
                        "src": "687:7:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "visibility": "internal"
                    }
                  ],
                  "id": 26591,
                  "nodeType": "VariableDeclarationStatement",
                  "src": "687:14:107"
                },
                {
                  "body": {
                    "id": 26602,
                    "nodeType": "Block",
                    "src": "729:57:107",
                    "statements": [
                      {
                        "expression": {
                          "id": 26596,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "nodeType": "UnaryOperation",
                          "operator": "++",
                          "prefix": false,
                          "src": "743:8:107",
                          "subExpression": {
                            "id": 26595,
                            "name": "digits",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 26590,
                            "src": "743:6:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "id": 26597,
                        "nodeType": "ExpressionStatement",
                        "src": "743:8:107"
                      },
                      {
                        "expression": {
                          "id": 26600,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftHandSide": {
                            "id": 26598,
                            "name": "temp",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 26586,
                            "src": "765:4:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "nodeType": "Assignment",
                          "operator": "/=",
                          "rightHandSide": {
                            "hexValue": "3130",
                            "id": 26599,
                            "isConstant": false,
                            "isLValue": false,
                            "isPure": true,
                            "kind": "number",
                            "lValueRequested": false,
                            "nodeType": "Literal",
                            "src": "773:2:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_rational_10_by_1",
                              "typeString": "int_const 10"
                            },
                            "value": "10"
                          },
                          "src": "765:10:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "id": 26601,
                        "nodeType": "ExpressionStatement",
                        "src": "765:10:107"
                      }
                    ]
                  },
                  "condition": {
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 26594,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "id": 26592,
                      "name": "temp",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 26586,
                      "src": "718:4:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "!=",
                    "rightExpression": {
                      "hexValue": "30",
                      "id": 26593,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "number",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "726:1:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_rational_0_by_1",
                        "typeString": "int_const 0"
                      },
                      "value": "0"
                    },
                    "src": "718:9:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bool",
                      "typeString": "bool"
                    }
                  },
                  "id": 26603,
                  "nodeType": "WhileStatement",
                  "src": "711:75:107"
                },
                {
                  "assignments": [
                    26605
                  ],
                  "declarations": [
                    {
                      "constant": false,
                      "id": 26605,
                      "mutability": "mutable",
                      "name": "buffer",
                      "nameLocation": "808:6:107",
                      "nodeType": "VariableDeclaration",
                      "scope": 26648,
                      "src": "795:19:107",
                      "stateVariable": false,
                      "storageLocation": "memory",
                      "typeDescriptions": {
                        "typeIdentifier": "t_bytes_memory_ptr",
                        "typeString": "bytes"
                      },
                      "typeName": {
                        "id": 26604,
                        "name": "bytes",
                        "nodeType": "ElementaryTypeName",
                        "src": "795:5:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bytes_storage_ptr",
                          "typeString": "bytes"
                        }
                      },
                      "visibility": "internal"
                    }
                  ],
                  "id": 26610,
                  "initialValue": {
                    "arguments": [
                      {
                        "id": 26608,
                        "name": "digits",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 26590,
                        "src": "827:6:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      ],
                      "id": 26607,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "lValueRequested": false,
                      "nodeType": "NewExpression",
                      "src": "817:9:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_objectcreation_pure$_t_uint256_$returns$_t_bytes_memory_ptr_$",
                        "typeString": "function (uint256) pure returns (bytes memory)"
                      },
                      "typeName": {
                        "id": 26606,
                        "name": "bytes",
                        "nodeType": "ElementaryTypeName",
                        "src": "821:5:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bytes_storage_ptr",
                          "typeString": "bytes"
                        }
                      }
                    },
                    "id": 26609,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "817:17:107",
                    "tryCall": false,
                    "typeDescriptions": {
                      "typeIdentifier": "t_bytes_memory_ptr",
                      "typeString": "bytes memory"
                    }
                  },
                  "nodeType": "VariableDeclarationStatement",
                  "src": "795:39:107"
                },
                {
                  "body": {
                    "id": 26641,
                    "nodeType": "Block",
                    "src": "863:131:107",
                    "statements": [
                      {
                        "expression": {
                          "id": 26616,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftHandSide": {
                            "id": 26614,
                            "name": "digits",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 26590,
                            "src": "877:6:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "nodeType": "Assignment",
                          "operator": "-=",
                          "rightHandSide": {
                            "hexValue": "31",
                            "id": 26615,
                            "isConstant": false,
                            "isLValue": false,
                            "isPure": true,
                            "kind": "number",
                            "lValueRequested": false,
                            "nodeType": "Literal",
                            "src": "887:1:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_rational_1_by_1",
                              "typeString": "int_const 1"
                            },
                            "value": "1"
                          },
                          "src": "877:11:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "id": 26617,
                        "nodeType": "ExpressionStatement",
                        "src": "877:11:107"
                      },
                      {
                        "expression": {
                          "id": 26635,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftHandSide": {
                            "baseExpression": {
                              "id": 26618,
                              "name": "buffer",
                              "nodeType": "Identifier",
                              "overloadedDeclarations": [],
                              "referencedDeclaration": 26605,
                              "src": "902:6:107",
                              "typeDescriptions": {
                                "typeIdentifier": "t_bytes_memory_ptr",
                                "typeString": "bytes memory"
                              }
                            },
                            "id": 26620,
                            "indexExpression": {
                              "id": 26619,
                              "name": "digits",
                              "nodeType": "Identifier",
                              "overloadedDeclarations": [],
                              "referencedDeclaration": 26590,
                              "src": "909:6:107",
                              "typeDescriptions": {
                                "typeIdentifier": "t_uint256",
                                "typeString": "uint256"
                              }
                            },
                            "isConstant": false,
                            "isLValue": true,
                            "isPure": false,
                            "lValueRequested": true,
                            "nodeType": "IndexAccess",
                            "src": "902:14:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_bytes1",
                              "typeString": "bytes1"
                            }
                          },
                          "nodeType": "Assignment",
                          "operator": "=",
                          "rightHandSide": {
                            "arguments": [
                              {
                                "arguments": [
                                  {
                                    "commonType": {
                                      "typeIdentifier": "t_uint256",
                                      "typeString": "uint256"
                                    },
                                    "id": 26632,
                                    "isConstant": false,
                                    "isLValue": false,
                                    "isPure": false,
                                    "lValueRequested": false,
                                    "leftExpression": {
                                      "hexValue": "3438",
                                      "id": 26625,
                                      "isConstant": false,
                                      "isLValue": false,
                                      "isPure": true,
                                      "kind": "number",
                                      "lValueRequested": false,
                                      "nodeType": "Literal",
                                      "src": "932:2:107",
                                      "typeDescriptions": {
                                        "typeIdentifier": "t_rational_48_by_1",
                                        "typeString": "int_const 48"
                                      },
                                      "value": "48"
                                    },
                                    "nodeType": "BinaryOperation",
                                    "operator": "+",
                                    "rightExpression": {
                                      "arguments": [
                                        {
                                          "commonType": {
                                            "typeIdentifier": "t_uint256",
                                            "typeString": "uint256"
                                          },
                                          "id": 26630,
                                          "isConstant": false,
                                          "isLValue": false,
                                          "isPure": false,
                                          "lValueRequested": false,
                                          "leftExpression": {
                                            "id": 26628,
                                            "name": "value",
                                            "nodeType": "Identifier",
                                            "overloadedDeclarations": [],
                                            "referencedDeclaration": 26573,
                                            "src": "945:5:107",
                                            "typeDescriptions": {
                                              "typeIdentifier": "t_uint256",
                                              "typeString": "uint256"
                                            }
                                          },
                                          "nodeType": "BinaryOperation",
                                          "operator": "%",
                                          "rightExpression": {
                                            "hexValue": "3130",
                                            "id": 26629,
                                            "isConstant": false,
                                            "isLValue": false,
                                            "isPure": true,
                                            "kind": "number",
                                            "lValueRequested": false,
                                            "nodeType": "Literal",
                                            "src": "953:2:107",
                                            "typeDescriptions": {
                                              "typeIdentifier": "t_rational_10_by_1",
                                              "typeString": "int_const 10"
                                            },
                                            "value": "10"
                                          },
                                          "src": "945:10:107",
                                          "typeDescriptions": {
                                            "typeIdentifier": "t_uint256",
                                            "typeString": "uint256"
                                          }
                                        }
                                      ],
                                      "expression": {
                                        "argumentTypes": [
                                          {
                                            "typeIdentifier": "t_uint256",
                                            "typeString": "uint256"
                                          }
                                        ],
                                        "id": 26627,
                                        "isConstant": false,
                                        "isLValue": false,
                                        "isPure": true,
                                        "lValueRequested": false,
                                        "nodeType": "ElementaryTypeNameExpression",
                                        "src": "937:7:107",
                                        "typeDescriptions": {
                                          "typeIdentifier": "t_type$_t_uint256_$",
                                          "typeString": "type(uint256)"
                                        },
                                        "typeName": {
                                          "id": 26626,
                                          "name": "uint256",
                                          "nodeType": "ElementaryTypeName",
                                          "src": "937:7:107",
                                          "typeDescriptions": {}
                                        }
                                      },
                                      "id": 26631,
                                      "isConstant": false,
                                      "isLValue": false,
                                      "isPure": false,
                                      "kind": "typeConversion",
                                      "lValueRequested": false,
                                      "names": [],
                                      "nodeType": "FunctionCall",
                                      "src": "937:19:107",
                                      "tryCall": false,
                                      "typeDescriptions": {
                                        "typeIdentifier": "t_uint256",
                                        "typeString": "uint256"
                                      }
                                    },
                                    "src": "932:24:107",
                                    "typeDescriptions": {
                                      "typeIdentifier": "t_uint256",
                                      "typeString": "uint256"
                                    }
                                  }
                                ],
                                "expression": {
                                  "argumentTypes": [
                                    {
                                      "typeIdentifier": "t_uint256",
                                      "typeString": "uint256"
                                    }
                                  ],
                                  "id": 26624,
                                  "isConstant": false,
                                  "isLValue": false,
                                  "isPure": true,
                                  "lValueRequested": false,
                                  "nodeType": "ElementaryTypeNameExpression",
                                  "src": "926:5:107",
                                  "typeDescriptions": {
                                    "typeIdentifier": "t_type$_t_uint8_$",
                                    "typeString": "type(uint8)"
                                  },
                                  "typeName": {
                                    "id": 26623,
                                    "name": "uint8",
                                    "nodeType": "ElementaryTypeName",
                                    "src": "926:5:107",
                                    "typeDescriptions": {}
                                  }
                                },
                                "id": 26633,
                                "isConstant": false,
                                "isLValue": false,
                                "isPure": false,
                                "kind": "typeConversion",
                                "lValueRequested": false,
                                "names": [],
                                "nodeType": "FunctionCall",
                                "src": "926:31:107",
                                "tryCall": false,
                                "typeDescriptions": {
                                  "typeIdentifier": "t_uint8",
                                  "typeString": "uint8"
                                }
                              }
                            ],
                            "expression": {
                              "argumentTypes": [
                                {
                                  "typeIdentifier": "t_uint8",
                                  "typeString": "uint8"
                                }
                              ],
                              "id": 26622,
                              "isConstant": false,
                              "isLValue": false,
                              "isPure": true,
                              "lValueRequested": false,
                              "nodeType": "ElementaryTypeNameExpression",
                              "src": "919:6:107",
                              "typeDescriptions": {
                                "typeIdentifier": "t_type$_t_bytes1_$",
                                "typeString": "type(bytes1)"
                              },
                              "typeName": {
                                "id": 26621,
                                "name": "bytes1",
                                "nodeType": "ElementaryTypeName",
                                "src": "919:6:107",
                                "typeDescriptions": {}
                              }
                            },
                            "id": 26634,
                            "isConstant": false,
                            "isLValue": false,
                            "isPure": false,
                            "kind": "typeConversion",
                            "lValueRequested": false,
                            "names": [],
                            "nodeType": "FunctionCall",
                            "src": "919:39:107",
                            "tryCall": false,
                            "typeDescriptions": {
                              "typeIdentifier": "t_bytes1",
                              "typeString": "bytes1"
                            }
                          },
                          "src": "902:56:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_bytes1",
                            "typeString": "bytes1"
                          }
                        },
                        "id": 26636,
                        "nodeType": "ExpressionStatement",
                        "src": "902:56:107"
                      },
                      {
                        "expression": {
                          "id": 26639,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftHandSide": {
                            "id": 26637,
                            "name": "value",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 26573,
                            "src": "972:5:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "nodeType": "Assignment",
                          "operator": "/=",
                          "rightHandSide": {
                            "hexValue": "3130",
                            "id": 26638,
                            "isConstant": false,
                            "isLValue": false,
                            "isPure": true,
                            "kind": "number",
                            "lValueRequested": false,
                            "nodeType": "Literal",
                            "src": "981:2:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_rational_10_by_1",
                              "typeString": "int_const 10"
                            },
                            "value": "10"
                          },
                          "src": "972:11:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "id": 26640,
                        "nodeType": "ExpressionStatement",
                        "src": "972:11:107"
                      }
                    ]
                  },
                  "condition": {
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 26613,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "id": 26611,
                      "name": "value",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 26573,
                      "src": "851:5:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "!=",
                    "rightExpression": {
                      "hexValue": "30",
                      "id": 26612,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "number",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "860:1:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_rational_0_by_1",
                        "typeString": "int_const 0"
                      },
                      "value": "0"
                    },
                    "src": "851:10:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bool",
                      "typeString": "bool"
                    }
                  },
                  "id": 26642,
                  "nodeType": "WhileStatement",
                  "src": "844:150:107"
                },
                {
                  "expression": {
                    "arguments": [
                      {
                        "id": 26645,
                        "name": "buffer",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 26605,
                        "src": "1017:6:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bytes_memory_ptr",
                          "typeString": "bytes memory"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bytes_memory_ptr",
                          "typeString": "bytes memory"
                        }
                      ],
                      "id": 26644,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "lValueRequested": false,
                      "nodeType": "ElementaryTypeNameExpression",
                      "src": "1010:6:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_type$_t_string_storage_ptr_$",
                        "typeString": "type(string storage pointer)"
                      },
                      "typeName": {
                        "id": 26643,
                        "name": "string",
                        "nodeType": "ElementaryTypeName",
                        "src": "1010:6:107",
                        "typeDescriptions": {}
                      }
                    },
                    "id": 26646,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "typeConversion",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "1010:14:107",
                    "tryCall": false,
                    "typeDescriptions": {
                      "typeIdentifier": "t_string_memory_ptr",
                      "typeString": "string memory"
                    }
                  },
                  "functionReturnParameters": 26577,
                  "id": 26647,
                  "nodeType": "Return",
                  "src": "1003:21:107"
                }
              ]
            },
            "documentation": {
              "id": 26571,
              "nodeType": "StructuredDocumentation",
              "src": "233:90:107",
              "text": " @dev Converts a `uint256` to its ASCII `string` decimal representation."
            },
            "id": 26649,
            "implemented": true,
            "kind": "function",
            "modifiers": [],
            "name": "toString",
            "nameLocation": "337:8:107",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 26574,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 26573,
                  "mutability": "mutable",
                  "name": "value",
                  "nameLocation": "354:5:107",
                  "nodeType": "VariableDeclaration",
                  "scope": 26649,
                  "src": "346:13:107",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 26572,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "346:7:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "visibility": "internal"
                }
              ],
              "src": "345:15:107"
            },
            "returnParameters": {
              "id": 26577,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 26576,
                  "mutability": "mutable",
                  "name": "",
                  "nameLocation": "-1:-1:-1",
                  "nodeType": "VariableDeclaration",
                  "scope": 26649,
                  "src": "384:13:107",
                  "stateVariable": false,
                  "storageLocation": "memory",
                  "typeDescriptions": {
                    "typeIdentifier": "t_string_memory_ptr",
                    "typeString": "string"
                  },
                  "typeName": {
                    "id": 26575,
                    "name": "string",
                    "nodeType": "ElementaryTypeName",
                    "src": "384:6:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_string_storage_ptr",
                      "typeString": "string"
                    }
                  },
                  "visibility": "internal"
                }
              ],
              "src": "383:15:107"
            },
            "scope": 26767,
            "src": "328:703:107",
            "stateMutability": "pure",
            "virtual": false,
            "visibility": "internal"
          },
          {
            "body": {
              "id": 26689,
              "nodeType": "Block",
              "src": "1210:255:107",
              "statements": [
                {
                  "condition": {
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 26659,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "id": 26657,
                      "name": "value",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 26652,
                      "src": "1224:5:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "==",
                    "rightExpression": {
                      "hexValue": "30",
                      "id": 26658,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "number",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "1233:1:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_rational_0_by_1",
                        "typeString": "int_const 0"
                      },
                      "value": "0"
                    },
                    "src": "1224:10:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bool",
                      "typeString": "bool"
                    }
                  },
                  "id": 26663,
                  "nodeType": "IfStatement",
                  "src": "1220:54:107",
                  "trueBody": {
                    "id": 26662,
                    "nodeType": "Block",
                    "src": "1236:38:107",
                    "statements": [
                      {
                        "expression": {
                          "hexValue": "30783030",
                          "id": 26660,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": true,
                          "kind": "string",
                          "lValueRequested": false,
                          "nodeType": "Literal",
                          "src": "1257:6:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_stringliteral_27489e20a0060b723a1748bdff5e44570ee9fae64141728105692eac6031e8a4",
                            "typeString": "literal_string \"0x00\""
                          },
                          "value": "0x00"
                        },
                        "functionReturnParameters": 26656,
                        "id": 26661,
                        "nodeType": "Return",
                        "src": "1250:13:107"
                      }
                    ]
                  }
                },
                {
                  "assignments": [
                    26665
                  ],
                  "declarations": [
                    {
                      "constant": false,
                      "id": 26665,
                      "mutability": "mutable",
                      "name": "temp",
                      "nameLocation": "1291:4:107",
                      "nodeType": "VariableDeclaration",
                      "scope": 26689,
                      "src": "1283:12:107",
                      "stateVariable": false,
                      "storageLocation": "default",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "typeName": {
                        "id": 26664,
                        "name": "uint256",
                        "nodeType": "ElementaryTypeName",
                        "src": "1283:7:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "visibility": "internal"
                    }
                  ],
                  "id": 26667,
                  "initialValue": {
                    "id": 26666,
                    "name": "value",
                    "nodeType": "Identifier",
                    "overloadedDeclarations": [],
                    "referencedDeclaration": 26652,
                    "src": "1298:5:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "nodeType": "VariableDeclarationStatement",
                  "src": "1283:20:107"
                },
                {
                  "assignments": [
                    26669
                  ],
                  "declarations": [
                    {
                      "constant": false,
                      "id": 26669,
                      "mutability": "mutable",
                      "name": "length",
                      "nameLocation": "1321:6:107",
                      "nodeType": "VariableDeclaration",
                      "scope": 26689,
                      "src": "1313:14:107",
                      "stateVariable": false,
                      "storageLocation": "default",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "typeName": {
                        "id": 26668,
                        "name": "uint256",
                        "nodeType": "ElementaryTypeName",
                        "src": "1313:7:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "visibility": "internal"
                    }
                  ],
                  "id": 26671,
                  "initialValue": {
                    "hexValue": "30",
                    "id": 26670,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": true,
                    "kind": "number",
                    "lValueRequested": false,
                    "nodeType": "Literal",
                    "src": "1330:1:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_rational_0_by_1",
                      "typeString": "int_const 0"
                    },
                    "value": "0"
                  },
                  "nodeType": "VariableDeclarationStatement",
                  "src": "1313:18:107"
                },
                {
                  "body": {
                    "id": 26682,
                    "nodeType": "Block",
                    "src": "1359:57:107",
                    "statements": [
                      {
                        "expression": {
                          "id": 26676,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "nodeType": "UnaryOperation",
                          "operator": "++",
                          "prefix": false,
                          "src": "1373:8:107",
                          "subExpression": {
                            "id": 26675,
                            "name": "length",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 26669,
                            "src": "1373:6:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "id": 26677,
                        "nodeType": "ExpressionStatement",
                        "src": "1373:8:107"
                      },
                      {
                        "expression": {
                          "id": 26680,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftHandSide": {
                            "id": 26678,
                            "name": "temp",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 26665,
                            "src": "1395:4:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "nodeType": "Assignment",
                          "operator": ">>=",
                          "rightHandSide": {
                            "hexValue": "38",
                            "id": 26679,
                            "isConstant": false,
                            "isLValue": false,
                            "isPure": true,
                            "kind": "number",
                            "lValueRequested": false,
                            "nodeType": "Literal",
                            "src": "1404:1:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_rational_8_by_1",
                              "typeString": "int_const 8"
                            },
                            "value": "8"
                          },
                          "src": "1395:10:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "id": 26681,
                        "nodeType": "ExpressionStatement",
                        "src": "1395:10:107"
                      }
                    ]
                  },
                  "condition": {
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 26674,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "id": 26672,
                      "name": "temp",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 26665,
                      "src": "1348:4:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "!=",
                    "rightExpression": {
                      "hexValue": "30",
                      "id": 26673,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "number",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "1356:1:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_rational_0_by_1",
                        "typeString": "int_const 0"
                      },
                      "value": "0"
                    },
                    "src": "1348:9:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bool",
                      "typeString": "bool"
                    }
                  },
                  "id": 26683,
                  "nodeType": "WhileStatement",
                  "src": "1341:75:107"
                },
                {
                  "expression": {
                    "arguments": [
                      {
                        "id": 26685,
                        "name": "value",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 26652,
                        "src": "1444:5:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      {
                        "id": 26686,
                        "name": "length",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 26669,
                        "src": "1451:6:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      ],
                      "id": 26684,
                      "name": "toHexString",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [
                        26690,
                        26766
                      ],
                      "referencedDeclaration": 26766,
                      "src": "1432:11:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_string_memory_ptr_$",
                        "typeString": "function (uint256,uint256) pure returns (string memory)"
                      }
                    },
                    "id": 26687,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "1432:26:107",
                    "tryCall": false,
                    "typeDescriptions": {
                      "typeIdentifier": "t_string_memory_ptr",
                      "typeString": "string memory"
                    }
                  },
                  "functionReturnParameters": 26656,
                  "id": 26688,
                  "nodeType": "Return",
                  "src": "1425:33:107"
                }
              ]
            },
            "documentation": {
              "id": 26650,
              "nodeType": "StructuredDocumentation",
              "src": "1037:94:107",
              "text": " @dev Converts a `uint256` to its ASCII `string` hexadecimal representation."
            },
            "id": 26690,
            "implemented": true,
            "kind": "function",
            "modifiers": [],
            "name": "toHexString",
            "nameLocation": "1145:11:107",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 26653,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 26652,
                  "mutability": "mutable",
                  "name": "value",
                  "nameLocation": "1165:5:107",
                  "nodeType": "VariableDeclaration",
                  "scope": 26690,
                  "src": "1157:13:107",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 26651,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1157:7:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "visibility": "internal"
                }
              ],
              "src": "1156:15:107"
            },
            "returnParameters": {
              "id": 26656,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 26655,
                  "mutability": "mutable",
                  "name": "",
                  "nameLocation": "-1:-1:-1",
                  "nodeType": "VariableDeclaration",
                  "scope": 26690,
                  "src": "1195:13:107",
                  "stateVariable": false,
                  "storageLocation": "memory",
                  "typeDescriptions": {
                    "typeIdentifier": "t_string_memory_ptr",
                    "typeString": "string"
                  },
                  "typeName": {
                    "id": 26654,
                    "name": "string",
                    "nodeType": "ElementaryTypeName",
                    "src": "1195:6:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_string_storage_ptr",
                      "typeString": "string"
                    }
                  },
                  "visibility": "internal"
                }
              ],
              "src": "1194:15:107"
            },
            "scope": 26767,
            "src": "1136:329:107",
            "stateMutability": "pure",
            "virtual": false,
            "visibility": "internal"
          },
          {
            "body": {
              "id": 26765,
              "nodeType": "Block",
              "src": "1678:351:107",
              "statements": [
                {
                  "assignments": [
                    26701
                  ],
                  "declarations": [
                    {
                      "constant": false,
                      "id": 26701,
                      "mutability": "mutable",
                      "name": "buffer",
                      "nameLocation": "1701:6:107",
                      "nodeType": "VariableDeclaration",
                      "scope": 26765,
                      "src": "1688:19:107",
                      "stateVariable": false,
                      "storageLocation": "memory",
                      "typeDescriptions": {
                        "typeIdentifier": "t_bytes_memory_ptr",
                        "typeString": "bytes"
                      },
                      "typeName": {
                        "id": 26700,
                        "name": "bytes",
                        "nodeType": "ElementaryTypeName",
                        "src": "1688:5:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bytes_storage_ptr",
                          "typeString": "bytes"
                        }
                      },
                      "visibility": "internal"
                    }
                  ],
                  "id": 26710,
                  "initialValue": {
                    "arguments": [
                      {
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 26708,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "commonType": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          },
                          "id": 26706,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftExpression": {
                            "hexValue": "32",
                            "id": 26704,
                            "isConstant": false,
                            "isLValue": false,
                            "isPure": true,
                            "kind": "number",
                            "lValueRequested": false,
                            "nodeType": "Literal",
                            "src": "1720:1:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_rational_2_by_1",
                              "typeString": "int_const 2"
                            },
                            "value": "2"
                          },
                          "nodeType": "BinaryOperation",
                          "operator": "*",
                          "rightExpression": {
                            "id": 26705,
                            "name": "length",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 26695,
                            "src": "1724:6:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "src": "1720:10:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "nodeType": "BinaryOperation",
                        "operator": "+",
                        "rightExpression": {
                          "hexValue": "32",
                          "id": 26707,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": true,
                          "kind": "number",
                          "lValueRequested": false,
                          "nodeType": "Literal",
                          "src": "1733:1:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_rational_2_by_1",
                            "typeString": "int_const 2"
                          },
                          "value": "2"
                        },
                        "src": "1720:14:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      ],
                      "id": 26703,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "lValueRequested": false,
                      "nodeType": "NewExpression",
                      "src": "1710:9:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_objectcreation_pure$_t_uint256_$returns$_t_bytes_memory_ptr_$",
                        "typeString": "function (uint256) pure returns (bytes memory)"
                      },
                      "typeName": {
                        "id": 26702,
                        "name": "bytes",
                        "nodeType": "ElementaryTypeName",
                        "src": "1714:5:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bytes_storage_ptr",
                          "typeString": "bytes"
                        }
                      }
                    },
                    "id": 26709,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "1710:25:107",
                    "tryCall": false,
                    "typeDescriptions": {
                      "typeIdentifier": "t_bytes_memory_ptr",
                      "typeString": "bytes memory"
                    }
                  },
                  "nodeType": "VariableDeclarationStatement",
                  "src": "1688:47:107"
                },
                {
                  "expression": {
                    "id": 26715,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftHandSide": {
                      "baseExpression": {
                        "id": 26711,
                        "name": "buffer",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 26701,
                        "src": "1745:6:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bytes_memory_ptr",
                          "typeString": "bytes memory"
                        }
                      },
                      "id": 26713,
                      "indexExpression": {
                        "hexValue": "30",
                        "id": 26712,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": true,
                        "kind": "number",
                        "lValueRequested": false,
                        "nodeType": "Literal",
                        "src": "1752:1:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_rational_0_by_1",
                          "typeString": "int_const 0"
                        },
                        "value": "0"
                      },
                      "isConstant": false,
                      "isLValue": true,
                      "isPure": false,
                      "lValueRequested": true,
                      "nodeType": "IndexAccess",
                      "src": "1745:9:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_bytes1",
                        "typeString": "bytes1"
                      }
                    },
                    "nodeType": "Assignment",
                    "operator": "=",
                    "rightHandSide": {
                      "hexValue": "30",
                      "id": 26714,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "string",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "1757:3:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_stringliteral_044852b2a670ade5407e78fb2863c51de9fcb96542a07186fe3aeda6bb8a116d",
                        "typeString": "literal_string \"0\""
                      },
                      "value": "0"
                    },
                    "src": "1745:15:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bytes1",
                      "typeString": "bytes1"
                    }
                  },
                  "id": 26716,
                  "nodeType": "ExpressionStatement",
                  "src": "1745:15:107"
                },
                {
                  "expression": {
                    "id": 26721,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftHandSide": {
                      "baseExpression": {
                        "id": 26717,
                        "name": "buffer",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 26701,
                        "src": "1770:6:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bytes_memory_ptr",
                          "typeString": "bytes memory"
                        }
                      },
                      "id": 26719,
                      "indexExpression": {
                        "hexValue": "31",
                        "id": 26718,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": true,
                        "kind": "number",
                        "lValueRequested": false,
                        "nodeType": "Literal",
                        "src": "1777:1:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_rational_1_by_1",
                          "typeString": "int_const 1"
                        },
                        "value": "1"
                      },
                      "isConstant": false,
                      "isLValue": true,
                      "isPure": false,
                      "lValueRequested": true,
                      "nodeType": "IndexAccess",
                      "src": "1770:9:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_bytes1",
                        "typeString": "bytes1"
                      }
                    },
                    "nodeType": "Assignment",
                    "operator": "=",
                    "rightHandSide": {
                      "hexValue": "78",
                      "id": 26720,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "string",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "1782:3:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_stringliteral_7521d1cadbcfa91eec65aa16715b94ffc1c9654ba57ea2ef1a2127bca1127a83",
                        "typeString": "literal_string \"x\""
                      },
                      "value": "x"
                    },
                    "src": "1770:15:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bytes1",
                      "typeString": "bytes1"
                    }
                  },
                  "id": 26722,
                  "nodeType": "ExpressionStatement",
                  "src": "1770:15:107"
                },
                {
                  "body": {
                    "id": 26751,
                    "nodeType": "Block",
                    "src": "1840:87:107",
                    "statements": [
                      {
                        "expression": {
                          "id": 26745,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftHandSide": {
                            "baseExpression": {
                              "id": 26737,
                              "name": "buffer",
                              "nodeType": "Identifier",
                              "overloadedDeclarations": [],
                              "referencedDeclaration": 26701,
                              "src": "1854:6:107",
                              "typeDescriptions": {
                                "typeIdentifier": "t_bytes_memory_ptr",
                                "typeString": "bytes memory"
                              }
                            },
                            "id": 26739,
                            "indexExpression": {
                              "id": 26738,
                              "name": "i",
                              "nodeType": "Identifier",
                              "overloadedDeclarations": [],
                              "referencedDeclaration": 26724,
                              "src": "1861:1:107",
                              "typeDescriptions": {
                                "typeIdentifier": "t_uint256",
                                "typeString": "uint256"
                              }
                            },
                            "isConstant": false,
                            "isLValue": true,
                            "isPure": false,
                            "lValueRequested": true,
                            "nodeType": "IndexAccess",
                            "src": "1854:9:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_bytes1",
                              "typeString": "bytes1"
                            }
                          },
                          "nodeType": "Assignment",
                          "operator": "=",
                          "rightHandSide": {
                            "baseExpression": {
                              "id": 26740,
                              "name": "_HEX_SYMBOLS",
                              "nodeType": "Identifier",
                              "overloadedDeclarations": [],
                              "referencedDeclaration": 26570,
                              "src": "1866:12:107",
                              "typeDescriptions": {
                                "typeIdentifier": "t_bytes16",
                                "typeString": "bytes16"
                              }
                            },
                            "id": 26744,
                            "indexExpression": {
                              "commonType": {
                                "typeIdentifier": "t_uint256",
                                "typeString": "uint256"
                              },
                              "id": 26743,
                              "isConstant": false,
                              "isLValue": false,
                              "isPure": false,
                              "lValueRequested": false,
                              "leftExpression": {
                                "id": 26741,
                                "name": "value",
                                "nodeType": "Identifier",
                                "overloadedDeclarations": [],
                                "referencedDeclaration": 26693,
                                "src": "1879:5:107",
                                "typeDescriptions": {
                                  "typeIdentifier": "t_uint256",
                                  "typeString": "uint256"
                                }
                              },
                              "nodeType": "BinaryOperation",
                              "operator": "&",
                              "rightExpression": {
                                "hexValue": "307866",
                                "id": 26742,
                                "isConstant": false,
                                "isLValue": false,
                                "isPure": true,
                                "kind": "number",
                                "lValueRequested": false,
                                "nodeType": "Literal",
                                "src": "1887:3:107",
                                "typeDescriptions": {
                                  "typeIdentifier": "t_rational_15_by_1",
                                  "typeString": "int_const 15"
                                },
                                "value": "0xf"
                              },
                              "src": "1879:11:107",
                              "typeDescriptions": {
                                "typeIdentifier": "t_uint256",
                                "typeString": "uint256"
                              }
                            },
                            "isConstant": false,
                            "isLValue": false,
                            "isPure": false,
                            "lValueRequested": false,
                            "nodeType": "IndexAccess",
                            "src": "1866:25:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_bytes1",
                              "typeString": "bytes1"
                            }
                          },
                          "src": "1854:37:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_bytes1",
                            "typeString": "bytes1"
                          }
                        },
                        "id": 26746,
                        "nodeType": "ExpressionStatement",
                        "src": "1854:37:107"
                      },
                      {
                        "expression": {
                          "id": 26749,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftHandSide": {
                            "id": 26747,
                            "name": "value",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 26693,
                            "src": "1905:5:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "nodeType": "Assignment",
                          "operator": ">>=",
                          "rightHandSide": {
                            "hexValue": "34",
                            "id": 26748,
                            "isConstant": false,
                            "isLValue": false,
                            "isPure": true,
                            "kind": "number",
                            "lValueRequested": false,
                            "nodeType": "Literal",
                            "src": "1915:1:107",
                            "typeDescriptions": {
                              "typeIdentifier": "t_rational_4_by_1",
                              "typeString": "int_const 4"
                            },
                            "value": "4"
                          },
                          "src": "1905:11:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "id": 26750,
                        "nodeType": "ExpressionStatement",
                        "src": "1905:11:107"
                      }
                    ]
                  },
                  "condition": {
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 26733,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "id": 26731,
                      "name": "i",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 26724,
                      "src": "1828:1:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": ">",
                    "rightExpression": {
                      "hexValue": "31",
                      "id": 26732,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "number",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "1832:1:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_rational_1_by_1",
                        "typeString": "int_const 1"
                      },
                      "value": "1"
                    },
                    "src": "1828:5:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bool",
                      "typeString": "bool"
                    }
                  },
                  "id": 26752,
                  "initializationExpression": {
                    "assignments": [
                      26724
                    ],
                    "declarations": [
                      {
                        "constant": false,
                        "id": 26724,
                        "mutability": "mutable",
                        "name": "i",
                        "nameLocation": "1808:1:107",
                        "nodeType": "VariableDeclaration",
                        "scope": 26752,
                        "src": "1800:9:107",
                        "stateVariable": false,
                        "storageLocation": "default",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "typeName": {
                          "id": 26723,
                          "name": "uint256",
                          "nodeType": "ElementaryTypeName",
                          "src": "1800:7:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "visibility": "internal"
                      }
                    ],
                    "id": 26730,
                    "initialValue": {
                      "commonType": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "id": 26729,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": false,
                      "lValueRequested": false,
                      "leftExpression": {
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 26727,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "hexValue": "32",
                          "id": 26725,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": true,
                          "kind": "number",
                          "lValueRequested": false,
                          "nodeType": "Literal",
                          "src": "1812:1:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_rational_2_by_1",
                            "typeString": "int_const 2"
                          },
                          "value": "2"
                        },
                        "nodeType": "BinaryOperation",
                        "operator": "*",
                        "rightExpression": {
                          "id": 26726,
                          "name": "length",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 26695,
                          "src": "1816:6:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "src": "1812:10:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "nodeType": "BinaryOperation",
                      "operator": "+",
                      "rightExpression": {
                        "hexValue": "31",
                        "id": 26728,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": true,
                        "kind": "number",
                        "lValueRequested": false,
                        "nodeType": "Literal",
                        "src": "1825:1:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_rational_1_by_1",
                          "typeString": "int_const 1"
                        },
                        "value": "1"
                      },
                      "src": "1812:14:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "VariableDeclarationStatement",
                    "src": "1800:26:107"
                  },
                  "loopExpression": {
                    "expression": {
                      "id": 26735,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": false,
                      "lValueRequested": false,
                      "nodeType": "UnaryOperation",
                      "operator": "--",
                      "prefix": true,
                      "src": "1835:3:107",
                      "subExpression": {
                        "id": 26734,
                        "name": "i",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 26724,
                        "src": "1837:1:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "id": 26736,
                    "nodeType": "ExpressionStatement",
                    "src": "1835:3:107"
                  },
                  "nodeType": "ForStatement",
                  "src": "1795:132:107"
                },
                {
                  "expression": {
                    "arguments": [
                      {
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 26756,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "id": 26754,
                          "name": "value",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 26693,
                          "src": "1944:5:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "nodeType": "BinaryOperation",
                        "operator": "==",
                        "rightExpression": {
                          "hexValue": "30",
                          "id": 26755,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": true,
                          "kind": "number",
                          "lValueRequested": false,
                          "nodeType": "Literal",
                          "src": "1953:1:107",
                          "typeDescriptions": {
                            "typeIdentifier": "t_rational_0_by_1",
                            "typeString": "int_const 0"
                          },
                          "value": "0"
                        },
                        "src": "1944:10:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      },
                      {
                        "hexValue": "537472696e67733a20686578206c656e67746820696e73756666696369656e74",
                        "id": 26757,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": true,
                        "kind": "string",
                        "lValueRequested": false,
                        "nodeType": "Literal",
                        "src": "1956:34:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_stringliteral_04fc88320d7c9f639317c75102c103ff0044d3075a5c627e24e76e5bbb2733c2",
                          "typeString": "literal_string \"Strings: hex length insufficient\""
                        },
                        "value": "Strings: hex length insufficient"
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        },
                        {
                          "typeIdentifier": "t_stringliteral_04fc88320d7c9f639317c75102c103ff0044d3075a5c627e24e76e5bbb2733c2",
                          "typeString": "literal_string \"Strings: hex length insufficient\""
                        }
                      ],
                      "id": 26753,
                      "name": "require",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [
                        -18,
                        -18
                      ],
                      "referencedDeclaration": -18,
                      "src": "1936:7:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                        "typeString": "function (bool,string memory) pure"
                      }
                    },
                    "id": 26758,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "1936:55:107",
                    "tryCall": false,
                    "typeDescriptions": {
                      "typeIdentifier": "t_tuple$__$",
                      "typeString": "tuple()"
                    }
                  },
                  "id": 26759,
                  "nodeType": "ExpressionStatement",
                  "src": "1936:55:107"
                },
                {
                  "expression": {
                    "arguments": [
                      {
                        "id": 26762,
                        "name": "buffer",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 26701,
                        "src": "2015:6:107",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bytes_memory_ptr",
                          "typeString": "bytes memory"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bytes_memory_ptr",
                          "typeString": "bytes memory"
                        }
                      ],
                      "id": 26761,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "lValueRequested": false,
                      "nodeType": "ElementaryTypeNameExpression",
                      "src": "2008:6:107",
                      "typeDescriptions": {
                        "typeIdentifier": "t_type$_t_string_storage_ptr_$",
                        "typeString": "type(string storage pointer)"
                      },
                      "typeName": {
                        "id": 26760,
                        "name": "string",
                        "nodeType": "ElementaryTypeName",
                        "src": "2008:6:107",
                        "typeDescriptions": {}
                      }
                    },
                    "id": 26763,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "typeConversion",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "2008:14:107",
                    "tryCall": false,
                    "typeDescriptions": {
                      "typeIdentifier": "t_string_memory_ptr",
                      "typeString": "string memory"
                    }
                  },
                  "functionReturnParameters": 26699,
                  "id": 26764,
                  "nodeType": "Return",
                  "src": "2001:21:107"
                }
              ]
            },
            "documentation": {
              "id": 26691,
              "nodeType": "StructuredDocumentation",
              "src": "1471:112:107",
              "text": " @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length."
            },
            "id": 26766,
            "implemented": true,
            "kind": "function",
            "modifiers": [],
            "name": "toHexString",
            "nameLocation": "1597:11:107",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 26696,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 26693,
                  "mutability": "mutable",
                  "name": "value",
                  "nameLocation": "1617:5:107",
                  "nodeType": "VariableDeclaration",
                  "scope": 26766,
                  "src": "1609:13:107",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 26692,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1609:7:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 26695,
                  "mutability": "mutable",
                  "name": "length",
                  "nameLocation": "1632:6:107",
                  "nodeType": "VariableDeclaration",
                  "scope": 26766,
                  "src": "1624:14:107",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 26694,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1624:7:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "visibility": "internal"
                }
              ],
              "src": "1608:31:107"
            },
            "returnParameters": {
              "id": 26699,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 26698,
                  "mutability": "mutable",
                  "name": "",
                  "nameLocation": "-1:-1:-1",
                  "nodeType": "VariableDeclaration",
                  "scope": 26766,
                  "src": "1663:13:107",
                  "stateVariable": false,
                  "storageLocation": "memory",
                  "typeDescriptions": {
                    "typeIdentifier": "t_string_memory_ptr",
                    "typeString": "string"
                  },
                  "typeName": {
                    "id": 26697,
                    "name": "string",
                    "nodeType": "ElementaryTypeName",
                    "src": "1663:6:107",
                    "typeDescriptions": {
                      "typeIdentifier": "t_string_storage_ptr",
                      "typeString": "string"
                    }
                  },
                  "visibility": "internal"
                }
              ],
              "src": "1662:15:107"
            },
            "scope": 26767,
            "src": "1588:441:107",
            "stateMutability": "pure",
            "virtual": false,
            "visibility": "internal"
          }
        ],
        "scope": 26768,
        "src": "146:1885:107",
        "usedErrors": []
      }
    ],
    "src": "86:1946:107"
  },
  "bytecode": "60566037600b82828239805160001a607314602a57634e487b7160e01b600052600060045260246000fd5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220c00ad445528e72d82cf22a2984180fddf0ca3bc3652cb96cfcee4f4971d5da8664736f6c63430008060033",
  "bytecodeSha1": "1ce946f6a4eaa185320328620ccf999b9e86db7c",
  "compiler": {
    "evm_version": "istanbul",
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "version": "0.8.6+commit.11564f7e"
  },
  "contractName": "Strings",
  "coverageMap": {
    "branches": {
      "107": {}
    },
    "statements": {
      "107": {}
    }
  },
  "dependencies": [],
  "deployedBytecode": "73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220c00ad445528e72d82cf22a2984180fddf0ca3bc3652cb96cfcee4f4971d5da8664736f6c63430008060033",
  "deployedSourceMap": "146:1885:107:-:0;;;;;;;;",
  "language": "Solidity",
  "natspec": {
    "details": "String operations.",
    "kind": "dev",
    "methods": {},
    "version": 1
  },
  "offset": [
    146,
    2031
  ],
  "opcodes": "PUSH20 0x0 ADDRESS EQ PUSH1 0x80 PUSH1 0x40 MSTORE PUSH1 0x0 DUP1 REVERT INVALID LOG2 PUSH5 0x6970667358 0x22 SLT KECCAK256 0xC0 EXP 0xD4 GASLIMIT MSTORE DUP15 PUSH19 0xD82CF22A2984180FDDF0CA3BC3652CB96CFCEE 0x4F 0x49 PUSH18 0xD5DA8664736F6C6343000806003300000000 ",
  "pcMap": {
    "0": {
      "offset": [
        146,
        2031
      ],
      "op": "PUSH20",
      "path": "107",
      "value": "0x0"
    },
    "21": {
      "fn": null,
      "offset": [
        146,
        2031
      ],
      "op": "ADDRESS",
      "path": "107"
    },
    "22": {
      "fn": null,
      "offset": [
        146,
        2031
      ],
      "op": "EQ",
      "path": "107"
    },
    "23": {
      "fn": null,
      "offset": [
        146,
        2031
      ],
      "op": "PUSH1",
      "path": "107",
      "value": "0x80"
    },
    "25": {
      "fn": null,
      "offset": [
        146,
        2031
      ],
      "op": "PUSH1",
      "path": "107",
      "value": "0x40"
    },
    "27": {
      "fn": null,
      "offset": [
        146,
        2031
      ],
      "op": "MSTORE",
      "path": "107"
    },
    "28": {
      "fn": null,
      "offset": [
        146,
        2031
      ],
      "op": "PUSH1",
      "path": "107",
      "value": "0x0"
    },
    "30": {
      "fn": null,
      "offset": [
        146,
        2031
      ],
      "op": "DUP1",
      "path": "107"
    },
    "31": {
      "fn": null,
      "offset": [
        146,
        2031
      ],
      "op": "REVERT",
      "path": "107"
    }
  },
  "sha1": "8da07805a3ba0f671b12c496f43ae8c2684df165",
  "source": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev String operations.\n */\nlibrary Strings {\n    bytes16 private constant _HEX_SYMBOLS = \"0123456789abcdef\";\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` decimal representation.\n     */\n    function toString(uint256 value) internal pure returns (string memory) {\n        // Inspired by OraclizeAPI's implementation - MIT licence\n        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\n\n        if (value == 0) {\n            return \"0\";\n        }\n        uint256 temp = value;\n        uint256 digits;\n        while (temp != 0) {\n            digits++;\n            temp /= 10;\n        }\n        bytes memory buffer = new bytes(digits);\n        while (value != 0) {\n            digits -= 1;\n            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\n            value /= 10;\n        }\n        return string(buffer);\n    }\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\n     */\n    function toHexString(uint256 value) internal pure returns (string memory) {\n        if (value == 0) {\n            return \"0x00\";\n        }\n        uint256 temp = value;\n        uint256 length = 0;\n        while (temp != 0) {\n            length++;\n            temp >>= 8;\n        }\n        return toHexString(value, length);\n    }\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\n     */\n    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {\n        bytes memory buffer = new bytes(2 * length + 2);\n        buffer[0] = \"0\";\n        buffer[1] = \"x\";\n        for (uint256 i = 2 * length + 1; i > 1; --i) {\n            buffer[i] = _HEX_SYMBOLS[value & 0xf];\n            value >>= 4;\n        }\n        require(value == 0, \"Strings: hex length insufficient\");\n        return string(buffer);\n    }\n}\n",
  "sourceMap": "146:1885:107:-:0;;;;;;;;;;;;;;;-1:-1:-1;;;146:1885:107;;;;;;;;;;;;;;;;;",
  "sourcePath": "node_modules/@openzeppelin/contracts/utils/Strings.sol",
  "type": "library"
}