If it's wearing a collar then it will be owned by someone, its the strays that are a problem. Unfortunately because of the crisis the abandoned animal situation is unbelievable at the moment. My advice would be to leave it as cats are very resilient and very good at persuading people to feed them and give them a cuddle. If you really are concerned let me know, I know a couple of kind residents on Roda who do help out with the cat situation.