input: Write a function to print keys and values of a list of dictionaries.
  assert print_dicts([{ "name": "Alice", "age": 30 }, { "name": "Bob", "age": 25 }]) == None
  assert print_dicts([{ "country": "USA", "capital": "Washington" }, { "country": "France", "capital": "Paris" }]) == None
output: def print_dicts(dicts):
      for d in dicts:
          for key, value in d.items():
              print(f"{key}: {value}")