input: Write a python function to split a sentence into individual words.
  assert get_words("The quick brown fox jumps over the lazy dog") == ["The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"]
  assert get_words("Hello world") == ["Hello", "world"]
  assert get_words("Python is great") == ["Python", "is", "great"]
output: def get_words(sentence):
      return sentence.split()