input: Write a function to take in a dictionary with string keys and integer values, and return the sum of all the values in the dictionary.
  assert compute_dict_sum({"a": 5, "b": 10, "c": 15}) == 30
  assert compute_dict_sum({"x": 1, "y": 2, "z": 3}) == 6
  assert compute_dict_sum({"m": 0, "n": 0, "o": 0}) == 0
  assert compute_dict_sum({}) == 0
  assert compute_dict_sum({"p": -5, "q": 5, "r": 10}) == 10
output: def compute_dict_sum(d):
      return sum(d.values())