pragma solidity ^0.4.25;

import 'openzeppelin-solidity/contracts/math/SafeMath.sol';


library MathHelper {

  using SafeMath for uint256;

  function max(uint256 a, uint256 b) internal pure returns (uint256 _max){
      _max = b;
      if (a > b) {
          _max = a;
      }
  }

  function min(uint256 a, uint256 b) internal pure returns (uint256 _min){
      _min = b;
      if (a < b) {
          _min = a;
      }
  }

  function sumNumbers(uint256[] _numbers) internal pure returns (uint256 _sum) {
      for (uint256 i=0;i<_numbers.length;i++) {
          _sum = _sum.add(_numbers[i]);
      }
  }
}