Sorry for bad english!
[https://github.com/mdsnins/ctf-writeups/blob/master/2019/Insomnihack%202019/l33t-hoster/l33t-hoster.md](https://github.com/mdsnins/ctf-writeups/blob/master/2019/Insomnihack%202019/l33t-hoster/l33t-hoster.md)