首次使用PCH，获取链接器工具错误

I'm a pretty novice programmer, just learning a little bit of c, but I always did it on Linux with gcc and Vim but decided to try using visual studio and I'm getting LNK2005 and LNK1169 errors, I've tried looking up the errors and how to fix them and properly use PCH because I think it would be useful to learn even if my programs are too small to make use of it.I'm a pretty novice programmer, just learning a