input: Write a function to store the strings "Hello" and "World" in variables and print them in the same line. If the function is successful, it should output "Hello World".
  assert store_and_print_strings()==None
  assert store_and_print_strings()=="Hello World"
  assert store_and_print_strings()=="Hello World"
  assert store_and_print_strings()=="Hello World"
  assert store_and_print_strings()=="Hello World"
output: def store_and_print_strings():
      string1 = "Hello"
      string2 = "World"
      print(string1 + " " + string2)