#include <stdio.h>
#include <stdlib.h>
 
struct list {
    int key;
    struct list *next;
};
 
void append(struct list *l1, struct list l2)
{
    l1 = malloc(sizeof *l1);
    *l1 = l2;
    l1->next = NULL;
}
 
int main(void)
{
    struct list *l1, l2 = { 42, NULL }, l3 = { 24, NULL };
 
    append(l1, l2);
    append(l1->next, l3);
 
    for (struct list *p = l1; p != NULL; p = p->next)
        printf("%d\n", p->key);
 
    free(l1->next);
    free(l1);
}
 

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