i see you've already solved it, but for those who are struggling, there is a purely math way to solve this kata. (Hint: look for patterns in the total_sum)

The description should probably get a touch-up, it is difficult to find what the return value should be when skimming it. But it does say as part of the example what those numbers are.

I also cannot understand the instructions.

00000000000000input array was modified:00000000000000

Also, what do you think this

Your task is to create a new .. array

means?

Skip all the numbers. What does the text say?