#include <stdlib.h>
#include <stdio.h>

struct node{
	struct node* prev;
	void* data;
};

typedef struct node* LIFO; 

LIFO* mklifo ();
void push(LIFO* lst , void*);
void* pop(LIFO* lst);

int main(void)
{
	char* t = "test";
	LIFO* lifo = mklifo();
	push(lifo, t);
	printf("%s", (char *)pop(lifo));
	
}

LIFO *mklifo (){
	LIFO* ret = malloc(sizeof(struct node));
	return ret;
}

void push(LIFO *lst , void *el){
	LIFO* next = mklifo();
	(*lst)->data = el;
	(*next)->prev = *lst;
	lst = next;
}

void *pop(LIFO *lst){
	void* el;
	(*lst)->data = el;
	*lst = (*lst)->prev;
	return el;
}