docs: def validate_md5(bag):
      """
      Check if Bag is valid
      :param obj bag: Bag
      :return None:
      """
      logger_bagit.info("validate_md5")
      if bag.is_valid():
          print("Valid md5")
          # for path, fixity in bag.entries.items():
          #     print("path:{}\nmd5:{}\n".format(path, fixity["md5"]))
      else:
          print("Invalid md5")
          logger_bagit.debug("invalid bag")
      return