[teo_zero]

Interesting project! I'm eagerly reading through it.

Probably I would have made different choices. For example, I'd rather have many modules that can be individually included, than one giant file.

Also from a purely aesthetic point of view, I would have opted for more readable function and type names: no sp_ prefix, recognizable names like dict istead of ht, vec instead of da, etc.

And I know there are compilers out there still stuck in the 90s, but I would have targeted C23, these days.

But that would be my highly opinionated library!

P.S. be aware that word frequency is not what the standard 'wc' does.