The project is complete, although contributions are welcomed, mostly for writing a good documentation.
Fork it, use it, edit it, floss code.
done on my MacBookPro on 25th April 2022
Benchmark 1: ./sudoku-solver solve board.txt Time (mean ± σ): 7.6 ms ± 0.7 ms [User: 6.2 ms, System: 0.6 ms] Range (min … max): 6.7 ms … 16.2 ms 276 runs