input: Write a python function to fetch the latest tweets containing a specific hashtag.
  assert fetch_latest_tweets("#python") is not None
  assert isinstance(fetch_latest_tweets("#coding"), list)
  assert all('#python' in tweet for tweet in fetch_latest_tweets("#python"))
output: def fetch_latest_tweets(hashtag):
      import tweepy
  
      # Replace these with your own API keys
      api_key = "YOUR_API_KEY"
      api_key_secret = "YOUR_API_KEY_SECRET"
      access_token = "YOUR_ACCESS_TOKEN"
      access_token_secret = "YOUR_ACCESS_TOKEN_SECRET"
  
      auth = tweepy.OAuth1UserHandler(api_key, api_key_secret, access_token, access_token_secret)
      api = tweepy.API(auth)
  
      try:
          tweets = api.search_tweets(q=hashtag, count=10, result_type="recent", tweet_mode="extended")
          return [tweet.full_text for tweet in tweets if hashtag in tweet.full_text]
      except tweepy.TweepError as e:
          print(f"Error: {e}")
          return None