Mac vscode Undefined symbols for architecture arm64: 报错

小白头文件引用， 求指点迷津。
ndefined symbols for architecture arm64:
"_game", referenced from:
_main in test-2845c4.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)