input: Write a function to sort the words in a string alphabetically.
  assert sortString("hello world this is a test") == "a hello is test this world"
  assert sortString("python is fun and exciting") == "and exciting fun is python"
  assert sortString("sort these words correctly") == "correctly sort these words"
output: def sortString(s: str) -> str:
      words = s.split()
      words.sort()
      return ' '.join(words)