input: Write a function to store the strings "Hello" and "World" and print them on the same line. Return the concatenated string.
  def store_and_print(string1, string2):
      result = string1 + " " + string2
      print(result)
      return result
  
  assert store_and_print("Hello", "World")=="Hello World"
  assert store_and_print("Hi", "There")=="Hi There"
  assert store_and_print("Good", "Morning")=="Good Morning"
  assert store_and_print("Python", "Programming")=="Python Programming"
  assert store_and_print("Welcome", "Back")=="Welcome Back"
output: def store_and_print(string1, string2):
      result = string1 + " " + string2
      print(result)
      return result