https://blog.gongquiz.com/2021/12/02/%ec%9d%8c%ec%86%8d%ec%9d%84-c-%eb%ac%bc%ec%b2%b4%ec%9d%98-%ec%86%8d%eb%8f%84%eb%a5%bc-v%eb%9d%bc%ea%b3%a0-%ed%95%a0-%eb%95%8c-mach-%ec%88%98%eb%8a%94-%ea%b0%80%ec%8a%a4%ea%b8%b0%ec%82%ac-2011/