* fix: linter and spacing for is_graph_bipartite.

* updating DIRECTORY.md

* clang-tidy fixes for a49ec9b8d79e62be49587043cf482a9f705e3ed1

* use clang-12

* downgrade to clang11

* added clang-format confiug file

* added explicit clang-format step in workflow

* fix git command

* commit format and lint together

lint first and then format

* corrected order

* Revert "Merge branch 'is_graph_bipartite' into fix_clang"

This reverts commit d4d406017502cc745a9a77b4d462dc7a4aea6522, reversing
changes made to 2ccc3a364e4a6491e62ad836a237eb1603ddef6a.
Co-authored-by: NFilip Hlásek <fhlasek@gmail.com>
Co-authored-by: Ngithub-actions <${GITHUB_ACTOR}@users.noreply.github.com>