input: Write a python function to print dictionary items.
  assert print_dict_items({'a': 1, 'b': 2, 'c': 3}) == "Key: a, Value: 1\nKey: b, Value: 2\nKey: c, Value: 3\n"
  assert print_dict_items({'x': 10, 'y': 20}) == "Key: x, Value: 10\nKey: y, Value: 20\n"
output: def print_dict_items(d):
      result = ""
      for key, value in d.items():
          result += f"Key: {key}, Value: {value}\n"
      return result