input: Write a function to calculate the sum of all values in a given dictionary (string → integer). 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({"x": -5, "y": 0, "z": 5}) == 0
  assert compute_dict_sum({}) == 0
  assert compute_dict_sum({"p": 100}) == 100
  assert compute_dict_sum({"q": 7, "r": 13}) == 20
output: def compute_dict_sum(d):
      return sum(d.values())