input: Write a function to sort words in a sentence alphabetically.
  assert sort_sentence("This is a great day") == ['This', 'a', 'day', 'great', 'is']
  assert sort_sentence("Python is fun") == ['Python', 'fun', 'is']
  assert sort_sentence("Sorting words in a sentence") == ['Sorting', 'a', 'in', 'sentence', 'words']
output: def sort_sentence(sentence):
      return sorted(sentence.split())