I'm planning to kill the cat and walk out of the driveway.
Why do you wanna kill the cat?
I'm going to farm my land and I can't leave the cat alone.
You can go farm your land without killing the cat. Surely the cat can survive on it's own until you get back. Is the cat stealing food or causing problems? Otherwise, you shouldn't kill your pets.
The cat can't stay alone so I will have to end it.
If you can't take care of your pet, then you should give it away, because killing it is not the right way to handle things. Take your cat to the shelter and let them take care of it.