Editing C based timer

<code>#include <iostream>
#include <unistd.h>
<using namespace std;
// Define the callback function
void callback() {
cout << "Timer callback called!" << endl;</code>

<code>}</code>

''<code>// Create the timer</code>''

<code>timer_t timer;</code>

<code>struct sigevent sigev;</code>

''<code>// Set up the timer</code>''

<code>sigev.sigev_notify = SIGEV_THREAD;</code>

<code>sigev.sigev_notify_function = callback;</code>

<code>sigev.sigev_value.sival_ptr = &timer;</code>

<code>timer_create(CLOCK_REALTIME, &sigev, &timer);</code>

''<code>// Start the timer</code>''

<code>timer_settime(timer, 0, new itimerspec{1, 0}, NULL);</code>

''<code>// Wait for the timer to expire</code>''

<code>pause();</code>

''<code>// Delete the timer</code>''

<code>timer_delete(timer);</code>