input: def store_and_print_strings():
      """
      Store the strings "Hello" and "World" and print them in the same line.
      >>> store_and_print_strings()
      Hello World
      """
      string1 = "Hello"
      string2 = "World"
      print(string1 + " " + string2)
output:     string1 = "Hello"
      string2 = "World"
      print(string1 + " " + string2)