Description

   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.