input: Write a python function to print all key-value pairs of a dictionary.
  assert print_key_value_pairs({'a': 1, 'b': 2, 'c': 3}) == None
  assert print_key_value_pairs({1: 'one', 2: 'two', 3: 'three'}) == None
  assert print_key_value_pairs({}) == None
output: def print_key_value_pairs(d):
      for key, value in d.items():
          print(f"{key}: {value}")