input: Write a function to implement a chatbot that can provide customer support in a restaurant. The function should read a user's question from 'random_user_question.txt' and respond with a randomly chosen message from a list of possible responses. If the user's question is 'What meals do you serve?', the chatbot should return one of the predefined response messages.
  def restaurant_chatbot():
      possible_responses = [
       'We serve a variety of dishes - from salads to pizzas to steaks!',
       'Check out our menu for a full list of options',
       'We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?',
       'We have a great selection of meals! What kind of dish are you looking for?',
       'We have a unique selection of meals - have you checked out our menu?'
      ]
      
      with open('random_user_question.txt') as user_question:
          question = user_question.read()
      
      if question.strip().lower() == 'what meals do you serve?':
          return random.choice(possible_responses)
      else:
          return "Sorry, I can't answer that question."
  
  # Assertions
  assert restaurant_chatbot() in [
      'We serve a variety of dishes - from salads to pizzas to steaks!',
      'Check out our menu for a full list of options',
      'We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?',
      'We have a great selection of meals! What kind of dish are you looking for?',
      'We have a unique selection of meals - have you checked out our menu?'
  ]
  assert restaurant_chatbot() in [
      'We serve a variety of dishes - from salads to pizzas to steaks!',
      'Check out our menu for a full list of options',
      'We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?',
      'We have a great selection of meals! What kind of dish are you looking for?',
      'We have a unique selection of meals - have you checked out our menu?'
  ]
  assert restaurant_chatbot()=="Sorry, I can't answer that question."
output: 
  def restaurant_chatbot():
      possible_responses = [
       'We serve a variety of dishes - from salads to pizzas to steaks!',
       'Check out our menu for a full list of options',
       'We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?',
       'We have a great selection of meals! What kind of dish are you looking for?',
       'We have a unique selection of meals - have you checked out our menu?'
      ]
      
      with open('random_user_question.txt') as user_question:
          question = user_question.read()
      
      if question.strip().lower() == 'what meals do you serve?':
          return random.choice(possible_responses)
      else:
          return "Sorry, I can't answer that question."
  