[[XST]O_x]

Strtok:
https://sampwiki.blast.hk/wiki/Strtok

And the other 2:
https://sampforum.blast.hk/showthread.php?tid=116292

Found them with a quick search.
However, this tutorial is very old and uses old and slow methods. Today there are much quicker and easier-to-use includes for that. You better off search for a tutorial around the forum that uses MySQL, foreach, zcmd and sscanf2.

EDIT:
Here is a tutorial with Y_ini (file system)
https://sampforum.blast.hk/showthread.php?tid=550865

And here is one with MySQL(database)
https://sampforum.blast.hk/showthread.php?tid=422295