it's in your passport
@Berk ****
they don't cancel it YOU do, ๐ฎ
You take the documentation to the immigration office where it was issued and cancel it before you leave the country
stamping out on an extension doesn't cancel it
AND
while you won't have any issue entering free stamp or getting a 30 day extension what you will have problems with is IF you ever go to apply for a long term extension (employment, marriage, education, etc).
That's when they'll see you didn't cancel your earlier extension and fine you for not following the rules