模仿 猜数 的交互库写法，但是炸了。

交互库代码，自己的程序

错误信息：

No valid executable file was produced by the compiler /nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: ./ccwBvGwZ.o: in function main': src:(.text+0x61): multiple definition of main'; /tmp/compiler_omrgk9az/lib.o:src:(.text.startup+0x0): first defined here collect2: 错误：ld 返回 1