input: Write a function to generate a list of lists of words from a given list of strings. The returned list should have the first word for each string followed by the 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(["Python is great", "Coding is fun"])==[["Python", "is", "great"], ["Coding", "is", "fun"]]
  assert get_word_lists(["One word"])==[["One", "word"]]
  assert get_word_lists([])==[]
  assert get_word_lists(["", ""])==[[], []]
output: def get_word_lists(strings):
      return [[word for word in s.split()] for s in strings]