(unify) Update code style.

[schmidtw]

Fix code style

Using Go 1.20 or 1.21, run:

find . -name '*.go' -exec gofmt -s -w {} \;

This should update the formatting so it is compliant.

Enable copyright checking in the action

In .github.workflows/ci.yml remove the line style-skip: true.

[johnabass]

Addressed by #108