input: Write a python function to process and analyze tweet data. The function should take a list of tweet JSON objects and return a list of tweet texts. 
  assert process_tweets([{"text": "Hello World!"}, {"text": "Kafka and Spark are awesome!"}]) == ["Hello World!", "Kafka and Spark are awesome!"]
  assert process_tweets([{"text": "Real-time data processing"}, {"text": "Distributed Systems"}]) == ["Real-time data processing", "Distributed Systems"]
  assert process_tweets([{"text": "Python is powerful"}, {"text": "Data Engineering"}]) == ["Python is powerful", "Data Engineering"]
output: def process_tweets(tweet_data):
      return [tweet['text'] for tweet in tweet_data]