SUBSTRING IN C WITHOUT BUILT IN FUNCTION
#include<stdio.h>
void sub(char b[],int nu,int le){
char c[le+1];
int i,j;
//printf("%d\n",strlen(c));
for(i=nu-1,j=0;j<le;i++,j++)
{
c[j]=b[i];
}
c[j]='\0';
printf("%s\n",c);
}
int main()
{
char s[100];
gets(s);
int n,l;
scanf("%d%d",&n,&l);
sub(s,n,l);
}
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