input: Write a python function to print each key-value pair in a dictionary.
  assert print_key_value_pairs({'Name': 'John', 'Age': 30, 'City': 'New York'}) == "Name: John\nAge: 30\nCity: New York\n"
  assert print_key_value_pairs({'Brand': 'Toyota', 'Model': 'Camry', 'Year': 2021}) == "Brand: Toyota\nModel: Camry\nYear: 2021\n"
  assert print_key_value_pairs({'Fruit': 'Apple', 'Color': 'Red', 'Price': 1.5}) == "Fruit: Apple\nColor: Red\nPrice: 1.5\n"
output: def print_key_value_pairs(d):
      result = ""
      for key, value in d.items():
          result += f"{key}: {value}\n"
      return result