Mi a baj ebben a programban, miert erroroziK?

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <string.h>

struct item{

int number;

char adat[20];

struct item *next;

};

typedef struct item * AUTO;

int kiir(AUTO head);

AUTO createItem(int numb, char *s);

AUTO insertAfter(AUTO act, AUTO elem);

int torolLista(AUTO L);

int torolElem(AUTO L);

int main(){

char szo[50];

AUTO head, act, elem;

clock_t st, fs;

head = act = NULL;

for(int i=0; i<16500000; i++)

{

elem = createItem(i, "elem");

act = insertAfter(act,elem);

if(head == NULL) head = act;

}

printf("durvan 1 gb memoria lefoglalva\n");

getchar();

fflush(stdin);

st = clock();

if (torolLista(head)==1) printf("torolve\n");

else printf("torles kozben hiba tortenhetett\n");

fs = clock();

printf("%lf <- Eltelt ido \n",(double)(fs-st)/CLOCKS_PER_SEC);

getchar();

fflush(stdin);

//----------------------------------------------

head = act = NULL;

for(int i=0; i<16500000; i++)

{

elem = createItem(i, "elem");

act = insertAfter(act,elem);

if(head == NULL) head = act;

}

printf("durvan 1 gb memoria lefoglalva\n");

getchar();

fflush(stdin);

st = clock();

while (head->next != NULL)

{

torolElem(head);

}

printf("torolve egyessevel\n");

fs = clock();

printf("%lf <- Eltelt ido \n",(double)(fs-st)/CLOCKS_PER_SEC);

getchar();

fflush(stdin);

return 0;

}

int kiir(AUTO head){

while (head->next){

head=head->next;

printf("%i %s\n",head->number,head->adat);

}

return 1;

}

AUTO createItem(int numb, char *s){

AUTO elem = (AUTO) malloc( sizeof( struct item));

elem->number = numb;

strcpy(elem->adat,s);

elem->next= NULL;

return elem;

}

AUTO insertAfter(AUTO act, AUTO elem){

if(act==NULL){

act = elem;

}

else {

act->next = elem;

act = elem;

}

return act;

}

int torolLista(AUTO L){

AUTO elem;

while (L->next != NULL){

elem=L;

L=L->next;

free(elem);

}

return 1;

}

int torolElem(AUTO L){

//torli az L utani elemet

if (L!=NULL){

if (L->next->next == NULL){ free(L->next); L->next=NULL;}

else{

AUTO elem;

elem=L->next;

L->next=L->next->next;

free(elem);

}

}

else

{

printf("error");

}

}