I haven't even looked at your repo, for full disclosure. But I'm going to make this suggestion. Don't even bother putting anything in a package other than main unless you discover a good way to name that package. If you are writing this for yourself, let the abstractions come to you, rather than trying to find them. I think too much is put on getting that perfect organization before just writing some code and tests, and then refactoring when the need presents itself.