input: Write a python function to reverse the words in a sentence.
  assert reverse_words_in_sentence("This is my sentence.") == "sentence. my is This"
  assert reverse_words_in_sentence("Hello World") == "World Hello"
  assert reverse_words_in_sentence("OpenAI is awesome") == "awesome is OpenAI"
output: def reverse_words_in_sentence(sentence):
      return ' '.join(sentence.split()[::-1])