input: Write a function called get_word_lists that takes a list of strings 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(["Python is great", "Java is also great"])==[["Python", "is", "great"], ["Java", "is", "also", "great"]]
  assert get_word_lists(["Learning programming", "Programming is fun"])==[["Learning", "programming"], ["Programming", "is", "fun"]]
  assert get_word_lists(["", "Empty string"])==[[], ["Empty", "string"]]
  assert get_word_lists([])==[]
output: def get_word_lists(strings):
      return [s.split() for s in strings]