50023. Combination Lock

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

/*
typedef struct Lock{
    int is_locked;
    int password;
} Lock;
*/

void init(Lock *lock){
    lock->is_locked = 0;
}

int lock(Lock *lock, int combination){
    if(lock->is_locked == 1) return -1;
    if(combination >= 10000 || combination < 0) return 10000;

    lock->is_locked = 1;
    lock->password = combination;
    return combination;
}

int unlock(Lock *lock, int combination){
    if(lock->is_locked == 0) return -1;

    if(lock->password == combination){
        lock->is_locked = 0;
        return 0;
    }
    else{
        return 1;
    }
}

int isLocked(Lock *lock){
    return lock->is_locked;
}