input: Write a function to calculate the sum of all values in a given dictionary where keys are strings and values are integers. Return the sum as an integer. If the dictionary is empty, return 0.
  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()) if d else 0