new_contents: from django.conf import settings
  from linebot import LineBotApi
  from linebot.models import (
      TextSendMessage,
      StickerSendMessage,
  )
  
  class ReplyGenerator():
      def __init__(self, line_bot_api):
          self.__line_bot_api = line_bot_api
          self.__history = []
          self.__recent_user_ids = []
  
      def reply_text(self, reply_token, text):
          if not settings.DEBUG:
              result = self.__line_bot_api.reply_message(
                  reply_token,
                  TextSendMessage(text=text)
              )
              print('result: ', result)
  
      def reply_sticker(self, reply_token, package_id, sticker_id):
          if not settings.DEBUG:
              result = self.__line_bot_api.reply_message(
                  reply_token,
                  StickerSendMessage(package_id=package_id, sticker_id=sticker_id)
              )
              print('result: ', result)
  
  
subject: Add ReplyGenerator class