Add ft_basename

[rask24]

Requirements

• The function prototype should be char *ft_basename(char *path);.
• If path is "/path/to/file.ext", it should return "file.ext".
• If path is "/", it should return "/".
• If path is "///" or any sequence of repeated slashes, it should return "/".
• If path is an empty string, it should return ".".
• If path ends with a slash, the trailing slash should be ignored.
• The function should directly modify the path argument.
• Thorough testing should be performed, including edge cases.

POSIX vs. GNU Implementations

There are two main versions of basename: POSIX and GNU. The key differences are:

POSIX version:

Directly modifies the path argument.
Returns a pointer to the modified path.

GNU version:

Does not modify the path argument.
Returns a pointer to a static buffer containing the result.
The path argument is declared as const char *.

For this implementation, we will follow the POSIX standard.