input: Write a python function to classify whether a movie review contains violent behavior.
  assert classify_movie('The movie is full of thrilling action scenes and lots of violence.') == 'Yes'
  assert classify_movie('A heartwarming story about love and friendship.') == 'No'
  assert classify_movie('The war scenes were intense and bloody.') == 'Yes'
output: def classify_movie(review):
      violent_keywords = ['violence', 'violent', 'bloody', 'war', 'fight', 'killing', 'murder']
      for word in violent_keywords:
          if word in review.lower():
              return 'Yes'
      return 'No'