input: Write a function to store the strings "Hello" and "World" and print them in the same line. If the given strings are empty then print "No strings provided".
  assert store_and_print("Hello", "World")==None
  assert store_and_print("Hello", "")=="No strings provided"
  assert store_and_print("", "World")=="No strings provided"
  assert store_and_print("", "")=="No strings provided"
output: def store_and_print(str1, str2):
      if str1 == "" and str2 == "":
          print("No strings provided")
      else:
          print(str1 + " " + str2)