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I'm not sure, if there's no gotchas in this question I feel like it'd be mostly copy and paste from the addition or subtraction command?

Doesn't necessarily mean that it's a good question of course.

I'd assume there's some kind of gotcha that makes naive solutions not scale. I may just be cynical, though.

No gotchas in there. It's a realistic and straight forward problem that exercises your ability to navigate and modify a well-written C codebase.

Take a look at part 2 for a step by step walkthrough of solving the problem.

Spoiler, it's basically copy paste of addition replacing + with *.