code: def normalize_files(files, separators=None):
  	
  	norm_files = {}
  	for path in files:
  		norm_files[normalize_file(path, separators=separators)] = path
  	return norm_files
docs: Normalizes the file paths to use the POSIX path separator.
  
  	*files* (:class:`~collections.abc.Iterable` of :class:`str`) contains
  	the file paths to be normalized.
  
  	*separators* (:class:`~collections.abc.Collection` of :class:`str`; or
  	:data:`None`) optionally contains the path separators to normalize.
  	See :func:`normalize_file` for more information.
  
  	Returns a :class:`dict` mapping the each normalized file path (:class:`str`)
  	to the original file path (:class:`str`)