input: def create_chatbot_with_state_diagrams():
      """Create a simple chatbot using Python and state diagrams. The chatbot starts at state0 and transitions between different states based on user input. Each state has a message to display and possible replies that lead to the next state. If the chatbot receives a reply that doesn't match any in the current state's replies, it will ask the user to try again. The conversation ends when a state with no replies is reached. 
  
      Example:
      >>> create_chatbot_with_state_diagrams()
  
      Output:
      'Hello! How can I help you?'
      '>> I need some advice'
      'Sure, what kind of advice do you need?'
      '>> Health advice'
      'Focus on eating healthy and staying active. Make sure to consult a medical professional if you have any concerns.'
      """     
      state0 = {
          'name': 'state0',
          'message': 'Hello! How can I help you?',
          'replies': {'I need some advice': 'state1', 'Can you answer my questions?': 'state2'}
      }
  
      state1 = {
          'name': 'state1',
          'message': 'Sure, what kind of advice do you need?',
          'replies': {'Career advice': 'state3','Health advice': 'state4'}
      }
  
      state2 = {
          'name': 'state2',
          'message': 'Yes, I\'ll do my best! What do you want to know?',
          'replies': {'Where can I find good tutorials': 'state5', 'Why is coding so hard': 'state6'}
      }
  
      state3 = {
          'name': 'state3',
          'message': 'It is always a good idea to research the field you are interested in and creating a plan to learn the skills that are required. Make sure to contact professionals in the field to understand their experience.',
          'replies': {}
      }
  
      state4 = {
          'name': 'state4',
          'message': 'Focus on eating healthy and staying active. Make sure to consult a medical professional if you have any concerns.',
          'replies': {}
      }
  
      state5 = {
          'name': 'state5',
          'message': 'You can find tutorials online or join coding communities to get help from experienced coders. StackOverflow and Cod Academy are great resources.',
          'replies': {}
      }
  
      state6 = {
          'name': 'state6',
          'message': 'Coding can be challenging, especially at first. Just remember that with practice, patience and problem solving skills you can overcome the obstacles.',
          'replies': {}
      }
  
      current_state = state0
      conversation = []
  
      while True:
          print(current_state['message'])
          conversation.append(current_state['message'])
  
          user_input = input('>> ')
          conversation.append(user_input)
  
          if user_input in current_state['replies']:
              current_state = eval(current_state['replies'][user_input])
          else:
              print("I don't understand what you mean. Please try again.")
  
          if not bool(current_state['replies']):
              print('Goodbye!')
              break
  
      print("=========================")
      print("Conversation:")
      for message in conversation:
          print(message)
output:     return conversation