Solve: String Character Sum

Created By: Geoffrey Challen

/ Version: 2021.2.0

Write a function called characterSum that sums the characters in a String and returns the result as an int. If the String is null you should return 0.

You should sum the characters based on their character code value, like this:

There are several ways to approach this problem. Note that, in Kotlin, you can use bracket notation to index into a String: