Implement callbacks which can be called after X time, assuming that there is only one timer available in the system. Once timer is started, it can be cancelled and then again started if required.\nAPI\n```\nregister_callback(void (*FPTR)(void *), void *arg, time _t delay) \n```\nAbove API can be called by any of the thread, sae thread call above API multiple time with same argument. Implemnet above.\n```\ntimer_interrupt() \n```\nAbove API will be called when timer expires, on expiry of timer, all possible API\'s should be called which timer expired. Implement timer_interrupt() as well .

Implement callbacks which can be called after X time, assuming that there is only one timer available in the system. Once timer is started, it can be cancelled 