I would have said that unless you distribute it, it is custom code
(as most software is) and none of our business. Not having the
source to custom code is fairly common through software life cycle
management failures. Foolishness in short.
If it's easy enough to recreate then it's a only few Kb on whatever
is your archive medium. I suggest you archive it there and look at
it in a years time so you can reflect on how much more you've learnt
about that programming language since. It's always an instructive
exercise.
Leny