A fast and simple in-place implementation of the luhn check algorithm in Go. Implementations in other languages can be found at github.com/luhnmod10.
go get github.com/luhnmod10/go
_ = luhnmod10.Valid("4242424242424242")Contributions are welcome! If you can improve the execution time of this implementation without increasing its complexity, please open a pull request. To test your change, run make in the repository to run the tests and the benchmarks.