root@mainframe:~# ./sanitize_module --input "welcome.txt"
[*] Running security filter...
[*] Sanitized string: welcome.txt
root@mainframe:~# cat /chall/downloads/welcome.txt
[*] Status: 200 OK - File Successfully Read
========================================================================
BEGIN FILE DUMP
========================================================================
Knock, knock, hacker. The white rabbit is in another directory.