input: 
  def print_hello_world():
      """ Create a Python program to store the strings "Hello" and "World" and print them in the same line.
      >>> print_hello_world()
      Hello World
      """
      string1 = "Hello"
      string2 = "World"
      print(string1 + " " + string2)
  
output:     string1 = "Hello"
      string2 = "World"
      print(string1 + " " + string2)