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