The basename function takes the UNIX style pathname pointed to
    by path and returns a pointer to the pathname's final component,
    deleting any trailing slash (/)  characters.

    If path consists entirely of the slash (/)  character, the
    function returns a pointer to the string "/".

    If path is a NULL pointer or points to an empty string, the
    function returns a pointer to the string ".".

    The basename function can modify the string pointed to by path.