When you press the rewind button, can you grab the film and pull it out from the takeup spool? Whatever is not in the cassettes is shot anyway.
If this works, take out cassette, rewind film into it by hand. Leave the damaged part out, cut it off, pull out a few inches. Cut the end like the leader on a new cassette. You now have a practice roll of film.
Try the winder/shutter with no film. press lightly on the takeup spool while winding to see if it turns. If it slips and does not turn at all, you have a damaged wind mechanism.
If the takeup reel DOES work, load your now-practice roll into the camera and try winding, snapping shutter, until you get to the end, where the wind lever will not move all the way. DO NOT EVER FORCE IT. Press rewind button and rewind. Then finish the wind stroke and snap the shutter.
Do this all with the camera back open so you can see what happens and which direction to turn the rewind knob.