https://blog.wongcw.com/2020/02/03/duplicate-cleaner-pro-v4-1-4-%e5%a4%9a%e8%aa%9e%e8%a8%80%e4%b8%ad%e6%96%87%e2%80%8b%e2%80%8b%e8%a8%bb%e5%86%8a%e7%89%88-%e9%87%8d%e8%a4%87%e6%96%87%e4%bb%b6%e6%b8%85%e7%90%86/