Structure Updating

Problem Statement
Write a c program to construct a structure, which holds second,minute,hour
take these value from user and assign them.
construct a function update which increases the time by one second each time

#include<stdio.h>
typedef struct time_struct{
  int hour;
  int minute;
  int sec;
}time;
void update(time *t1); 
int main()
{
  struct time_struct t1;
  int y;
  printf("enter hour \n");
  scanf("%d",&t1.hour);
  printf("enter minute \n");
  scanf("%d",&t1.minute);
  printf("enter second \n");
  scanf("%d",&t1.sec);
  printf("the given time is \n %d:%d:%d",t1.hour,t1.minute,t1.sec);
  update(&t1);
  printf("the updated time is \n %d:%d:%d",t1.hour,t1.minute,t1.sec);
  scanf("%d",&y);
  return 0;
}
void update(time *t1)
{
  if(t1->sec==59)
    {
      t1->sec=0;
      if(t1->minute==59)
{
 t1->minute=00;
 if(t1->hour==23)
   {
     t1->hour=00;
   }
 else
   {
     t1->hour=t1->hour+1;
   }
}
      else
{
 t1->minute=t1->minute+1;
}
    }
  else
    {
      t1->sec=t1->sec+1;
    }
  return ;
}