input: Write a function to sort the given list of words alphabetically. To achieve this, use the built-in `sort()` method of Python lists. If the list is empty, print an empty list.
  assert sort_words(['bubble', 'selection', 'quicksort', 'insertion'])==['bubble', 'insertion', 'quicksort', 'selection']
  assert sort_words(['apple', 'banana', 'cherry'])==['apple', 'banana', 'cherry']
  assert sort_words(['zebra', 'yak', 'xylophone'])==['xylophone', 'yak', 'zebra']
  assert sort_words([])==[]
output: def sort_words(words):
      if not words:
          return []
      words.sort()
      return words