Timer using c programming language

/* hello guys my name is Manjunath.
This below program is a timer prototype using c programming language*/

#include<stdio.h>
#include<unistd.h>
int main()
{
 int countdown;
 printf(" Enter duration: ");
 scanf("%d",&countdown);
 printf("\nstarts now:\n");
 while(countdown>0)
 {
   sleep(1);{
   printf("\t\t%d\n",countdown);
   }
   countdown--;
 }
 printf("Time's up");
 return 0;

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