input: Write a function to generate a list of all the words in both input strings. The function should take two strings as input and return a list containing all the words from both strings.
  def string_to_list(s1, s2):
      s1_list = s1.split()
      s2_list = s2.split()
      output_list = s1_list + s2_list
      return output_list
  assert string_to_list("I want to make a difference", "The journey to success is long")==['I', 'want', 'to', 'make', 'a', 'difference', 'The', 'journey', 'to', 'success', 'is', 'long']
  assert string_to_list("Hello world", "")==['Hello', 'world']
  assert string_to_list("", "Python is great")==['Python', 'is', 'great']
  assert string_to_list("", "")==[]
output: def string_to_list(s1, s2):
      s1_list = s1.split()
      s2_list = s2.split()
      output_list = s1_list + s2_list
      return output_list