Code cleanup

[maratik123]

1. [ ] Update documentation to reflect any user-facing changes - in this repository.

2. [ ] Make sure that the changes are covered by unit-tests.

3. [x] Run cargo clippy on the changes.

4. [x] Run cargo +nightly fmt on the changes.

5. [x] Please put changelog entries in the description of this Pull Request if knowledge of this change could be valuable to users. No need to put the entries to the changelog directly, they will be transferred to the changelog file by maintainers right after the Pull Request merge.

   Please remove any items from the template below that are not applicable.

6. [x] Describe in common words what is the purpose of this change, related Github Issues, and highlight important implementation aspects.

[marc0246]

Btw, markdown checkboxes work like this:

• [ ] Unchecked checkboxes are [ ] with a space in the middle.
• [x] Checked checkboxes are [x] with a letter X in the middle.

[marc0246]

Thanks!