input: Write a function to store the strings "Hello" and "World" and print them in the same line.
  
  def print_hello_world():
      string1 = "Hello"
      string2 = "World"
      print(string1 + " " + string2)
  
  assert print_hello_world() == None
output: def print_hello_world():
      string1 = "Hello"
      string2 = "World"
      print(string1 + " " + string2)