> I am not experienced enough to see where I could make improvements.
I've just skimmed through your repo and the first place where I would start
with the improvements is that [loooooooooooooooooong case
statement](https://github.com/NIMNIMNIMNIM/NIM16/blob/master/src/engine.nim#L121).
You could start with something like this (didn't test it, I write it directly
here on the forum):
let c = character.toLower()
case c
of 'a' .. 'z':
return c - 'a' + 1
of '1' .. '9':
return 26 + c - '0'
# etc.
Run
This keeps your return values as they are, but this could/should be improved
even more.
