input: Write a function to sort the given list of words in alphabetical order.
  def sort_words(words):
      words.sort()
      return words
  
  assert sort_words(['bubble', 'selection', 'quicksort', 'insertion'])==['bubble', 'insertion', 'quicksort', 'selection']
  assert sort_words(['zebra', 'apple', 'banana', 'dog'])==['apple', 'banana', 'dog', 'zebra']
  assert sort_words(['zebra'])==['zebra']
  assert sort_words([])==[]
output: def sort_words(words):
      words.sort()
      return words