input: Write a python function to print keys and values from a dictionary.
  assert print_values({'a': 1, 'b': 2, 'c': 3}) is None
  assert print_values({'x': 10, 'y': 20, 'z': 30}) is None
  assert print_values({'one': 1, 'two': 2, 'three': 3}) is None
output: def print_values(d):
      for key, value in d.items():
          print(f'{key}: {value}')