get thee a dark bag or a darkroom, take the film out of the back and IN TOTAL DARKNESS hook the paper backing back onto an empty spool and just start winding it up .

Be careful for when the end of the film comes along because it is not taped down to the paper on that end, when you reach/feel it just make sure it stays in the roll. When you get to the other end of the film, where it is taped down, there may be a bump if it is pushing against the tape there but that's not a big deal.

keep winding until you get to the end, turn on the lights, reload and shoot.