input: Write a function that takes no input and prints the strings "Hello" and "World" on the same line with a space between them.
  
  def print_hello_world():
      string1 = "Hello"
      string2 = "World"
      print(string1 + " " + string2)
  
  assert print_hello_world == None
output: def print_hello_world():
      print("Hello World")