Fix linting error

[tboerger]

Currently the go linter errors out on various places, we should fix that to increase the code quality.

[DblK]

Do you would like to have a huge PR or smaller PR by folder for example?
I saw on lint it misses several comments for each function.

Tell me what you want.

[xinity]

@DblK smaller PR are easier to review :)

so i'd vote for smaller ones

[tboerger]

👍 for smaller prs, as @xinity said it's better to review

[tboerger]

But continue with the models, I already started parts within the makefile pr