code: def _unquote_c_string(s):
       
  
       # doing a s.encode('utf-8').decode('unicode_escape') can return an
       # incorrect output with unicode string (both in py2 and py3) the safest way
       # is to match the escape sequences and decoding them alone.
       def decode_match(match):
            return utf8_bytes_string(
                 codecs.decode(match.group(0), 'unicode-escape')
            )
  
       if sys.version_info[0] >= 3 and isinstance(s, bytes):
            return ESCAPE_SEQUENCE_BYTES_RE.sub(decode_match, s)
       else:
            return ESCAPE_SEQUENCE_RE.sub(decode_match, s)
docs: replace C-style escape sequences (\n, \", etc.) with real chars.