FileHasher is a little program written in Go allowing to safely copy a source directory to a destination directory. This program uses xxhash hash to compare checksums for each of the file copied.
The GUI is built to be convenient to use. Just choose a source directory, one (or more) empty destination directory and click the "Start copy !" button !
If you find any issues/improvment for the code, feel free to create a github issue. If you want to solve it, feel free to associate a PR, I'll review it ASAP ;)