Go Lint Errors

[furkanbegen]

PaswallServer should pass all linter errors defined in golangci-lint package.

[yakuter]

Thank you @furkanbegen. I assigned you and me about this. Thank you for your support.

[mrtrkmn]

Super linter which is provided by Github could be quite efficient. Since it provides variety of lint options for a lot of environments and languages such as Dockerfile, ENV, CSS, GO, PHP and more.
Just a recommendation.

[yusufpapurcu]

Maybe after fixing this linter errors, linter can add into github workflow. For decreasing linter errors in coming with new pull requests.

[furkanbegen]

Maybe after fixing this linter errors, linter can add into github workflow. For decreasing linter errors in coming with new pull requests.

This make sense

[yakuter]

Thank you all for your comments. I used golangci-lint but want to give a chance to super linter. I will work on linter errors and then when they all finish I will add to github actions.