input: Write a python function to filter strings from a list that have more than one word.
  assert filter_strings(["hello", "hello world", "how are you", "fine"]) == ["hello world", "how are you"]
  assert filter_strings(["single", "multiple words here", "one more"]) == ["multiple words here", "one more"]
  assert filter_strings(["word", "two words", "another example"]) == ["two words", "another example"]
output: def filter_strings(strings):
      return [s for s in strings if len(s.split()) > 1]