i have a grnd vitara 2.5 and it feels like the clutch has

Hello

the first thing to do is bleed the clutch hydraulics and ensure that you replenish the all fluid in the system and get any trapped air out - the smaller reservoir is the one for the clutch so that needs filling with brake fluid and is part of the master cylinder

I favour having a clear hose from the nipple to a jar 1/2 full of old fluid and with the nipple closed your assistant pushes the pedal up and down a few times, then holds it down whilst you then crack open the nipple and close it again whilst fluid is still flowing.

then see how you go if the area at the top of the clutch pedal is wet with fluid then you'll have to replace the master cylinder

if thats OK then its the slave cylinder at the gearbox end which looks like this


also check that the flexible rubber hose is in good condition with no cracks or signs of leaking