help debug code c++ coin change

Question

I am not to use to c++ code I copied this code from an app over here in order to try to understand it. I cleaned out the code as munch as I could
https://code.sololearn.com/cvVi33IczG17/?ref=app

Answer 1

Here you go👇

https://code.sololearn.com/crMETrniTJ6f/?ref=app

Answer 2

Thank you Arsenic