style: Format sources using astyle 3.0.1 by jcfr · Pull Request #515 · cppcheck-opensource/simplecpp

This pull request reformats the codebase using astyle 3.0.1 to ensure consistency with the project’s current style guidelines.

Context

As noted in the review (#508 (comment)), the long-term plan is to transition formatting to uncrustify (likely by adapting the runformat script from the cppcheck repo). While that transition is being worked out, this change helps keep the repository consistent and avoids confusion for contributors.