input: Write a python function to reverse each string in a list of words.
  assert reverse_words(['hello', 'world']) == ['olleh', 'dlrow']
  assert reverse_words(['Python', 'is', 'fun']) == ['nohtyP', 'si', 'nuf']
  assert reverse_words(['a', 'b', 'c']) == ['a', 'b', 'c']
output: def reverse_words(words):
      return [word[::-1] for word in words]