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

struct List {
    int val;
    struct List* next;
};
typedef struct List List;

void function2(List* arg) {
    arg->val = 5;
    printf("%d\n", arg->val);
    arg = arg->next;
}

void function1(List** arg) {
    (*arg)->val = 5;
    printf("%d\n", (*arg)->val);
    *arg = (*arg)->next;
}

int main() {
    List* lista = (List*) malloc(sizeof(struct List));
    lista->next = NULL;
    function1(&lista);
    if (lista == NULL) {
        printf("JEST\n");
    }
    return 0;
}