input: Write a function named get_word_lists that takes a list of strings as input and generates a list of lists of words from the strings. The returned list should have the first word for each string followed by following words for each string.
  assert get_word_lists(["Hello world", "This is a test"])==[["Hello", "world"], ["This", "is", "a", "test"]]
  assert get_word_lists(["Quick brown fox", "Jumps over the lazy dog"])==[["Quick", "brown", "fox"], ["Jumps", "over", "the", "lazy", "dog"]]
  assert get_word_lists([])==[]
  assert get_word_lists(["SingleWordHere"])==[["SingleWordHere"]]
  assert get_word_lists(["One Two Three", "Four Five Six", "Seven Eight"])==[["One", "Two", "Three"], ["Four", "Five", "Six"], ["Seven", "Eight"]]
output: def get_word_lists(strings):
      return [s.split() for s in strings]