input: Write a function to swap the values of two variables and print their values after the swap. If the input variables are empty, return False.
  assert swap_values([5, 10])==print("x: 10\ny: 5")
  assert swap_values([100, 200])==print("x: 200\ny: 100")
  assert swap_values([])==False
output: def swap_values(variables):
      if not variables:
          return False
      x, y = variables
      x, y = y, x
      print(f"x: {x}\ny: {y}")