input: Write a python function to sort and remove duplicate words from a given string.
  assert sort_words("banana apple apple orange banana") == ['apple', 'banana', 'orange']
  assert sort_words("dog cat bird cat dog fish") == ['bird', 'cat', 'dog', 'fish']
  assert sort_words("car bike car bus") == ['bike', 'bus', 'car']
output: def sort_words(s):
      words = s.split()
      unique_words = set(words)
      sorted_words = sorted(unique_words)
      return sorted_words