int randInRange(int min, int max) {
    return rand() % (max + 1 - min) + min;
}

void spawnZombie() {
    for (int i = 0; i < ZOMBIE_COUNT; i++) {
        if (!zombies[i].alive) {
            zombies[i].frameX = 0;
            zombies[i].frameY = 0;
            zombies[i].x = randInRange(platform.x, platform.x + platform.w - zombieWidth);
            zombies[i].dir = survivor.x - zombies[i].x > 0 ? 1 : -1;
            zombies[i].y = 0;
            zombies[i].alive = true;
            zombies[i].state = "state_walk";
            return;
        }
    }
}