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

#define bool int
#define true 1
#define false 0

/*stos definiowanie*/
/*#####################################################################*/
typedef struct stos{
    int value;
    struct stos *next;
} stos;

stos *stos_create(int value)
{
    stos *s = malloc(sizeof(stos));
    s-> value = value;
    s-> next = NULL;
}

bool stos_is_empty(stos *s)
{
    if(s == NULL) return true;
    return false;
}

int stos_last(stos *s)
{
    int output = -1;

    while(s){

        output = s-> value;
        s = s -> next;
    }

    return output;
}

void stos_add_value(stos *s, int value)
{
    stos *start = s;
    stos *end = stos_create(value);

    while(s-> next != NULL){
        s = s -> next;
    }
    s->next = end;
    s = start;
}

void stos_withdraw(stos *s)
{

    if(stos_is_empty(s) == false){
        while(s->next != NULL) s = s->next;
        free(s);
    }
}

void stos_release(stos *s)
{
    stos *help_stos = s;
    if(stos_is_empty(s)){
        while(s){
            help_stos = s->next;
            free(s);
            s = help_stos;
        }
    }
}

void show_stos(stos *s)
{
    printf("stos starts:\n");
    while(s){
        printf("%d ",s->value);
        s = s->next;
    }
    printf("\nstos ends\n");
}
/*#######################################################################*/

/*stos_testowanie*/
int main(void)
{
    stos *s = stos_create(7);
    stos_add_value(s, 8);
    show_stos(s);
    stos_add_value(s, 8989);
    printf("ostatni: %d\n", stos_last(s));
    show_stos(s);

    stos_withdraw(s);
    printf("ostatni: %d\n", stos_last(s));

    show_stos(s);

    return 0;
}