input: Write a function to compute the sum of all values in a given dictionary where the keys are strings and the values are integers. Return the computed sum.
  assert compute_dict_sum({"a": 5, "b": 10, "c": 15})==30
  assert compute_dict_sum({"x": 3, "y": 7, "z": 12})==22
  assert compute_dict_sum({})==0
output: def compute_dict_sum(d):
      return sum(d.values())