Techie Brains

I found very good solutions here
implementing-stack-in-c-with-generic-style

http://stackoverflow.com/questions/10044184/void-pointers-in-generic-stack-implementation-plain-c

http://stackoverflow.com/questions/1963169/c-generic-programming

http://cboard.cprogramming.com/c-programming/139229-generic-polymorphic-stack-implementation-plain-c.html

I hope this will helps you