WAP to extract a substring from a string given lower and upper bound

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

void extract(char *s);

main()
{
      char str[20];
      printf("enter the strings");
      scanf("%s",str);    
      extract(str);

 printf("\n");
 system("pause");
}

void extract(char *s)
{
  int l,u,i;
  printf("enter the lower and upper bound");
  scanf("%d%d",&l,&u);
  l=l-1;
  u=u-1;

  for(i=l;i<=u;i++)
  printf("%c",*(s+i));

}
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