Change String position in C.

#include<stdio.h>

int main()

{

    char str[100],new_str[100];

    int i,n,j=0,c=0;

    printf("Enter a string: ");

    gets(str);

    printf("Enter a position: ");

    scanf("%d",&n);

    for(i=n,j=0;str[i]!='';i++,j++)

    {

        new_str[j]=str[i];  ///saving the string in a new string until NUll

    }

    for(i=0;i<n;i++,j++)

    {

        new_str[j]=str[i]; ///saving the string until n.

    }

    new_str[j]='';  ///assign the last value as NULL.

    printf("
Your New String: %s
",new_str);

    return 0;

}