I have the `par` value for each hole on a golf course and my stroke `score` on each hole. I have them stored as strings, because I wrote them down on a sheet of paper.  Right now, I'm using those strings to calculate my golf score by hand: take the difference between my actual `score` and the `par` of the hole, and add up the results for all 18 holes.
For example:
* If I took 7 shots on a hole where the par was 5, my score would be: 7 - 5 = 2
* If I got a hole-in-one where the par was 4, my score would be: 1 - 4 = -3.
Doing all this math by hand is really hard! Can you help make my life easier?
## Task Overview
Complete the function which accepts two strings and calculates the golf score of a game. Both strings will be of length 18, and each character in the string will be a number between 1 and 9 inclusive.
def digitsum(x):
    total = 0
    for letter in str(x):
        total += ord(letter)-48
    return total


def golf_score_calculator(par, score):
    return digitsum(score) - digitsum(par)

def digitsum(x):
    total = 0
    for letter in str(x):
        total += ord(letter)-48
    return total


def golf_score_calculator(par, score):
    return digitsum(score) - digitsum(par)
