Remove unused variables

[castellinilinguini]

Description

Remove unused variables.

Type of change

Please tick at least one of the options. Delete the other options.

• Code style

How Has This Been Tested?

See #75 .

Checklist For Contributor

• My code follows the style guidelines of this project (I installed pre-commit)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I wrote my changes in the changelog in the [unreleased] section
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

Checklist For Maintainers

• Continuous Integration (CI) is successfully running
• Do we want to release/tag a new version? [✔️ / ❌]
  • If yes, add a release to the changelog and set the new version in pyproject.toml. After the merge, tag the release!