input: Write a python function to extract unique values from a dictionary.
  assert unique_values({"a": 1, "b": 2, "c": 1, "d": 3}) == [1, 2, 3]
  assert unique_values({"key1": 10, "key2": 20, "key3": 10, "key4": 30, "key5": 20}) == [10, 20, 30]
  assert unique_values({"x": 100, "y": 200, "z": 100}) == [100, 200]
output: def unique_values(d):
      return list(set(d.values()))