code: def strip_toplevel_name(filelist):
      
      if not filelist:
          return filelist
      prefix = filelist[0]
      if '/' in prefix:
          prefix = prefix.partition('/')[0] + '/'
          names = filelist
      else:
          prefix = prefix + '/'
          names = filelist[1:]
      for name in names:
          if not name.startswith(prefix):
              raise Failure("File doesn't have the common prefix (%s): %s"
                            % (name, prefix))
      return [name[len(prefix):] for name in names]
docs: Strip toplevel name from a file list.
  
          >>> strip_toplevel_name(['a', 'a/b', 'a/c', 'a/c/d'])
          ['b', 'c', 'c/d']
  
          >>> strip_toplevel_name(['a/b', 'a/c', 'a/c/d'])
          ['b', 'c', 'c/d']