- https://github.com/adamretter/utf8-validator-c
- https://stackoverflow.com/questions/1301402/example-invalid-utf8-string
- https://codeforwin.org/c-programming/c-program-to-list-all-files-in-a-directory-recursively
- https://man7.org/linux/man-pages/man3/nftw.3.html
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