input: Write a python function to fetch recent tweets containing a specific hashtag using Tweepy.
  assert fetch_tweets('#Python')!=[]
  assert fetch_tweets('#Flask')!=[]
  assert fetch_tweets('#Tweepy')!=[]
output: def fetch_tweets(hashtag):
      import tweepy
      
      # Replace with your own credentials
      consumer_key = 'YOUR_CONSUMER_KEY'
      consumer_secret = 'YOUR_CONSUMER_SECRET'
      access_token = 'YOUR_ACCESS_TOKEN'
      access_token_secret = 'YOUR_ACCESS_TOKEN_SECRET'
      
      auth = tweepy.OAuth1UserHandler(consumer_key, consumer_secret, access_token, access_token_secret)
      api = tweepy.API(auth)
      
      tweets = api.search(q=hashtag, count=10, lang='en', result_type='recent')
      
      tweet_texts = [tweet.text for tweet in tweets]
      return tweet_texts