What is a good open-source BitTorrent library?

I am trying to make a BitTorrent client in C and I need a library. What is a good, widely-used open-source BitTorrent library for C? I've found libbt but the latest version was more than one and a half year ago. I have also tried GitHub but there was no C library.

Thanks in advance.

Solution

I prefer libTorrent in my own projects.

My C code works fine but crashes right before the end (0xC0000374)
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