input: Write a python function to reverse each word in a sentence.
  assert reverse_words('This sentence will be reversed') == 'sihT ecnetnes lliw eb desrever'
  assert reverse_words('Hello world') == 'olleH dlrow'
  assert reverse_words('Python is fun') == 'nohtyP si nuf'
output: def reverse_words(sentence: str) -> str:
      return ' '.join(word[::-1] for word in sentence.split())