input: Write a python function to print key-value pairs of a dictionary in the format "key: value".
  assert printDict({"Alice": 23, "Bob": 30, "John": 27}) == None
  assert printDict({"apple": 5, "banana": 7}) == None
  assert printDict({"key1": "value1", "key2": "value2"}) == None
output: def printDict(d):
      for key, value in d.items():
          print(f"{key}: {value}")