I think this is the best practice instead of using map() function that was used above

So intresting, if I checked it correctly, it in fact does not work if n > 10. For example for drink_string "10 beers, 200 shots" it returns 3 instead of 210. For drink_string "1 beer, 111 shots" it returns 4 glasses of water, so you'd be hangover for sure!

As I am a total newbie, can you please check it and explain why is that?