code: def _clean_up(paths):
      
      print('Cleaning up')
      # Iterate over the given paths, unlinking them
      for path in paths:
          print('Removing %s' % path)
          os.unlink(path)
docs: Clean up after ourselves, removing created files.
      @param {[String]} A list of file paths specifying the files we've created
          during run. Will all be deleted.
      @return {None}