Random Time Delay in C

 // generate a random number between 1 and 5
int random() 
{ 
    int i; 
    for (i = 0; i < 1; i++) { 
        int num = (rand() % 
           (5 - 1 + 1)) + 1; 
        return num; 
    } 
} 
  
//wait x number of seconds
void delay(int number_of_seconds) 
{ 
    // Converting time into milli_seconds 
    int milli_seconds = 1000 * number_of_seconds; 
  
    // Storing start time 
    clock_t start_time = clock(); 
  
    // looping till required time is not achieved 
    while (clock() < start_time + milli_seconds); 
} 
  


main(void) {
    init_elecanisms();
    
    
    while (1) {
        if (start==0){
            int t = random();       //t=random number betwen 1 and 5
            delay(t);               //delay for random number of seconds
            led = ON;
            LED2 = (p1 == 0) ? ON : OFF; 
            l1 = (SW3 == 0) ? ON : OFF; 
        }
    }    
}

int random() 
{ 
    int num; 
    num = rand() % 6; 
    return num;  
}