I'm sorry about your chickThe chick is slowly dying, I believe it has trouble breathing and the toes are starting to curl, we can't do anything farther than give it some electrolyte and probiotic. Is there an easier way to kill it now than let it suffer.

I agree, with a little one this size, a pair of sharp scissors works well.
For future reference for you and those that read/find your thread, the article below will help you with putting a small chick out of it's misery.
Tastefully done article with simple to follow instructions.
https://www.backyardchickens.com/ar...-for-squeamish-people-slightly-graphic.74734/