if Dark Link is killed what will happen to Link and the others?

well nothing happens to Link so what I found out is Link can kill Dark Link with just one hit of his master sword and the other one sword he needs to hit Dark Link five times before Dark Link dies. I think the master sword is better because when Link hit him with his master sword only one time Dark Link was dead. but that was an old time Dark Link grow stronger and more powerful how on earth is Link going to safe them all from Dark Link!