https://blog.faceutil.com/2017/03/22/%ea%b3%a0%ed%81%b4%eb%a6%b0-goclean-%eb%8b%a4%ec%9a%b4%eb%a1%9c%eb%93%9c-%eb%b0%8f-%ec%84%a4%ec%b9%98-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-%eb%b6%84%ec%84%9d-%d1%84/