input: Write a function that takes in a dictionary (string → integer) and returns the sum of all values in the dictionary. The function should be named compute_dict_sum.
  assert compute_dict_sum({"a": 5, "b": 10, "c": 15}) == 30
  assert compute_dict_sum({}) == 0
output: def compute_dict_sum(d):
      return sum(d.values())