It is there any source code for puzzle generator?

I want to learn code of puzzle generator - can you help me, please?

Do you know where can I find it?

I studied this page but I am not sure which one code is puzzle generator?

lichess.org/source

Maybe this could help you:
github.com/forhavu/Python-Puzzle-Creator

this fine gentleman used the lichess code to make a puzzle generator.

Hmm, looks like the puzzle generator is indeed missing there...

Here it is: github.com/clarkerubber/Python-Puzzle-Creator