code: def _validated_config_filename(self, name):
          
          dir_name = self._make_config_dir()
          filename = os.path.join(dir_name, name.split(".json")[0] + ".json")
          return filename
docs: Make config dir and return full file path and extension
  
          Args:
              name (str): Filename without dir or extension
  
          Returns:
              str: Full path including extension