The English section of the readme looks like it's a more-or-less literal translation of the Chinese section, so I think we can forgive a little spelling when it's clear his native language isn't English.

Judging by the site and the readme, it makes sense to assume that English is not the author's native language... It would make more sense to judge by the quality of the universal language there (C) and not half the readme (which can be easily fixed with a PR).

Sorry, my English is poor, I will try to fix some grammar errors

No problem. Sorry, I didn't realise English was your second language. Nice work on the library.

well, the coder is at least saying "optimizates", I have no clue what I would say "optimizes" in chinese, he is way better off than me!