input: Write a python function to print all key-value pairs in a dictionary.
  assert print_dict({"Name": "Donald Trump", "Age": 70, "Profession": "President"}) == None
  assert print_dict({"City": "New York", "Population": 8000000}) == None
output: def print_dict(d):
      for key, value in d.items():
          print(f"{key}: {value}")