def to_snake_case(name: str) -> str:
    result = []
    i = 0
    n = len(name)
    while i < n:
        if name[i].isupper():
            if i > 0:
                result.append("_")
            start = i
            if i + 1 < n and name[i + 1].islower():
                while i + 1 < n and name[i + 1].islower():
                    i += 1
            else:
                while i + 1 < n and name[i + 1].isupper():
                    i += 1
                if i + 1 < n:
                    i -= 1
            result.append(name[start : i + 1].lower())
        else:
            result.append(name[i])
        i += 1
    return "".join(result)


def to_pascal_case(name: str) -> str:
    return "".join(word.capitalize() for word in name.split("_"))


def to_camel_case(name: str) -> str:
    words = name.split("_")
    return words[0] + "".join(word.capitalize() for word in words[1:])


def to_macro_case(identifier: str) -> str:
    result = []
    for i, char in enumerate(identifier):
        if char.isupper() and i != 0:
            result.append("_")
        result.append(char)
    return "".join(result).upper()