I am doing a program to reverse a string with using recursion; however, when I upload my codes to the grader, it said like this:

Test FAILED.
Reason: Your answer is 10 words SHORTER than the solution.Command Executed: ./rev_print.out What's up Doc?
Input provided: 


Last 10 words of YOUR answer: 
SOLUTION from that point + 10 more words: The reverse of What's up Doc? is ?coD pu s'tahW
YOUR complete output: 

Complete SOLUTION: The reverse of What's up Doc? is ?coD pu s'tahW

I do not know why I am getting a blank in my output. Could someone help me to correct my codes and tell me where I am wrong?//
//  rev_print.c
//  Programs
//
//  Created by mac on 2017/6/4.
//  Copyright © 2017å¹´ mac. All rights reserved.
//

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

void rev_print(char *str) {
    
    char c;
    scanf("%c", &c);
    
    if (*str) {
        rev_print(str+1);
        
        printf("The reverse of %c is %c\n", c, *str);
    }
    
}

int main() {
    
    char a[100] = "";
    
    rev_print(a);
    
    return 0;
}

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Status NEW Posted 29 Nov 2017 11:11 AM My Price 10.00

-----------  ----------- H-----------ell-----------o S-----------ir/-----------Mad-----------am ----------- Th-----------ank----------- yo-----------u f-----------or -----------you-----------r i-----------nte-----------res-----------t a-----------nd -----------buy-----------ing----------- my----------- po-----------ste-----------d s-----------olu-----------tio-----------n. -----------Ple-----------ase----------- pi-----------ng -----------me -----------on -----------cha-----------t I----------- am----------- on-----------lin-----------e o-----------r i-----------nbo-----------x m-----------e a----------- me-----------ssa-----------ge -----------I w-----------ill----------- be----------- qu-----------ick-----------ly

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