Hi!
As the title says, what happens if i get an address wrong? Do the coins get lost?
If that's what happens, why not change the code in Bitcoin, so that if the bitcoin network cant detect that address, returns the bitcoins to you?
If you send your coin to the wrong address, well it's your fault for being careless. You should check if you copied correctly the address of the receiver to avoid any mistake because if you send it in the wrong address, you cannot retrieve what you send, unless the person who receives it will send it back to you but that's impossible.