code: def get_user_id(user_id_or_username):
      
      user_id_or_username = user_id_or_username.lower()
      if not user_id_or_username.startswith("user-"):
          user_id = "user-" + user_id_or_username.lower()
      else:
          user_id = user_id_or_username
      return user_id
docs: Gets the user ID based on the value `user_id_or_username` specified on
      the command-line, being extra lenient and lowercasing the value in all
      cases.