code: def unquote(string, encoding='utf-8', errors='replace'):
      
      if '%' not in string:
          string.split
          return string
      if encoding is None:
          encoding = 'utf-8'
      if errors is None:
          errors = 'replace'
      bits = _asciire.split(string)
      res = [bits[0]]
      append = res.append
      for i in range(1, len(bits), 2):
          append(unquote_to_bytes(bits[i]).decode(encoding, errors))
          append(bits[i + 1])
      return ''.join(res)
docs: Replace %xx escapes by their single-character equivalent. The optional
      encoding and errors parameters specify how to decode percent-encoded
      sequences into Unicode characters, as accepted by the bytes.decode()
      method.
      By default, percent-encoded sequences are decoded with UTF-8, and invalid
      sequences are replaced by a placeholder character.
  
      unquote('abc%20def') -> 'abc def'.