input: Write a function that calculates the sum of all values in a dictionary with string keys and integer values. The function should iterate over the dictionary's values, sum them up, and return the total sum.
  
  assert compute_dict_sum({"a": 5, "b": 10, "c": 15})==30
  assert compute_dict_sum({"x": 2, "y": 4, "z": 6})==12
  assert compute_dict_sum({})==0
  assert compute_dict_sum({"one": 1, "two": 2, "three": 3, "four": 4})==10
  assert compute_dict_sum({"apple": 3, "banana": 2, "cherry": 5})==10
output: def compute_dict_sum(d):
      return sum(d.values())