code: def normalize_utter_action(action_name: Text) -> Text:
      """Ensure that response names start with `utter_`.
  
      Args:
          action_name: The name of the response.
  
      Returns:
          The name of the response, starting with `utter_`.
      """
      return (
          f"{UTTER_PREFIX}{action_name[len(OBSOLETE_RESPOND_PREFIX):]}"
          if action_name.startswith(OBSOLETE_RESPOND_PREFIX)
          else action_name
      )
  
file_path: rasa/rasa/core/training/converters/responses_prefix_converter.py
imports: from pathlib import Path
  from typing import Text
  from rasa.shared.core.domain import Domain, InvalidDomain
  from rasa.shared.core.events import ActionExecuted
  from rasa.shared.core.training_data.story_reader.yaml_story_reader import YAMLStoryReader
  from rasa.shared.core.training_data.story_writer.yaml_story_writer import YAMLStoryWriter
  from rasa.shared.constants import UTTER_PREFIX
  from rasa.utils.converter import TrainingDataConverter
label_desc: Use image node_id 1 for calling a global function with example usage: normalize_utter_action(action_name) and returns: unknown