Totally hardcoded and poorly coded.
What exactly makes it only for "furien"? From what I can see, it can be used in any mod.
You're not allowed to upload compiled .amxx files - remove the file from the archive.
An approved plugin that does the same thing much better already exists -
https://forums.alliedmods.net/showthread.php?t=293632
PS: ADMIN_LEVEL_C is not flag "y".