input: Write a function to fetch the most recent tweets from a given Twitter user using the Tweepy library. If the tweets are fetched successfully, print each tweet's text. If the input username is empty, return an error message.
  
  def get_recent_tweets(username):
      if not username:
          return "Error: Username cannot be empty."
      
      import tweepy
  
      # Authenticate to Twitter
      auth = tweepy.OAuthHandler("CONSUMER_KEY", "CONSUMER_SECRET")
      auth.set_access_token("ACCESS_TOKEN", "ACCESS_TOKEN_SECRET")
      
      # Create API object
      api = tweepy.API(auth)
      
      # Get the most recent tweets from the given user
      tweets = api.user_timeline(screen_name=username)
      
      for tweet in tweets:
          print(tweet.text)
  
  assert get_recent_tweets("elonmusk") is None  # Assuming no error is raised and tweets are printed
  assert get_recent_tweets("") == "Error: Username cannot be empty."
output: def get_recent_tweets(username):
      if not username:
          return "Error: Username cannot be empty."
      
      import tweepy
  
      # Authenticate to Twitter
      auth = tweepy.OAuthHandler("CONSUMER_KEY", "CONSUMER_SECRET")
      auth.set_access_token("ACCESS_TOKEN", "ACCESS_TOKEN_SECRET")
      
      # Create API object
      api = tweepy.API(auth)
      
      # Get the most recent tweets from the given user
      tweets = api.user_timeline(screen_name=username)
      
      for tweet in tweets:
          print(tweet.text)