How to reverse a string in c without using reverse function

#include<stdio.h>
int main(){
    char str[50];
    char rev[50];
    int i=-1,j=0;

    printf("Enter any string : ");
    scanf("%s",str);
 
    while(str[++i]!='\0');

    while(i>=0)
     rev[j++] = str[--i];

    rev[j]='\0';
 
    printf("Reverse of string is : %s",rev);
 
    return 0;
}

Sample output:
Enter any string : ramprofessionals.blogspot.com
Reverse of string is : moc.topsgolb.slanoisseforpmar