It appears ( possibly, it is hard to tell ) to me that the leader is no longer smooth and has been hand cut.
Sometimes I have film loaded in my camera of an ASA that is not right for the light that I find myself wanting to photograph in, so I rewind it back just enough to leave the leader out of the cassette.
I may want to develop what I have shot on the roll before I shoot the rest of the roll, so in the darkroom I pull out enough to get what I shot and cut it off for development. I then cut the curve in the leader, ( Create a new leader on the film remaining in the cassette ) to match the factory leader so I can load the remainder in the camera. This means the number of shots on the roll is no longer what the factory label says, so I use tape and a marker to indicate approximately how many shots are in the cassette.
The only film that will be savable will be any that is still in the cassette, if there is any. You will need to go into a darkroom, ( Completely dark, not a closet with a sliver of light coming from under the door. BLACK, complete darkness ) and see if you can pull any film out of the cassette. If you can, then rewind it back in and you can shoot what is left. If you can't pull any out, then there is no more in the cassette.