It all depends on what you mean by curled. Yes, pictures can be helpful, but I think if you try this, you may have some luck:
Get a pipe cleaner and a band-aid. Use the pipe cleaner to bend to look like the footprint of the chick, and make it the size to fit its toes; tape the chicks feet to this 'shoe' for about a week. It should straighten it if it is just a toe curling problem.
I would also give it a drop of Poly-Vi-Sol baby vitamin drops, but just one drop. You can sort of take the tip of its beak and put it on the hole on the dropper and just give a drop that will run into the side of the beak and it will drink it. Just one drop is enough and make sure you use the kind with NO iron. If this doesn't work, then you should cull it. I have had it go both ways, but usually if it is just curled toes, it corrects it and you will look back and never know anything was wrong.
Good luck.