code: def GetDecoder(cls, encoding_method):
      
      encoding_method = encoding_method.lower()
      decoder = cls._decoders.get(encoding_method, None)
      if not decoder:
        return None
  
      return decoder()
docs: Retrieves the decoder object for a specific encoding method.
  
      Args:
        encoding_method (str): encoding method identifier.
  
      Returns:
        Decoder: decoder or None if the encoding method does not exists.