I am a cybersecurity student and I was doing an exercise in which I have to access the vip_queue function through a buffer overflow without changing the value of check. I’ve been trying for hours but I haven’t gotten any results. I hope you can help me, thank you. This is the code:

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

typedef struct {
    char name[32];
    int check;
} user_data;

void banner() {
    puts(" _   _ _          _____");
    puts("| \ | (_) ___ ___|  ___|__  _ __ _   _ _ __ ___  ___");
    puts("|  \| | |/ __/ _ \ |_ / _ \| '__| | | | '_ ` _ \/ __|");
    puts("| |\  | | (_|  __/  _| (_) | |  | |_| | | | | | \__ \");
    puts("|_| \_|_|\___\___|_|  \___/|_|   \__,_|_| |_| |_|___/");
    puts("nnn");
}

void vip_queue() {
    puts("[+] Your user is in the VIP list. Thanks for subscribing :D");
    puts("===================================");
    puts("===================================");
    puts("====      CONGRATULATIONS      ====");
    puts("===================================");
    puts("====        YOU MANAGED        ====");
    puts("====   TO EXPLOIT THE BINARY   ====");
    puts("===================================");
    puts("===================================");
    puts("==  STACK BASED BUFFER OVERFLOW  ==");
    puts("===================================");
    puts("===================================");
}

void get_user_info() {
    
    user_data data;
    data.check = 0;

    puts("[+] Welcome to NiceForums!");
    puts("[+] Please, submit your name or alias to continue with the subscription.");

    puts("Name or Alias:");
    gets(data.name);

    if ( data.check != 0 ) {
        puts("[!] ALERT! Stop trying strange stuff >:(");
        exit(1);
    }
    return; 
}

int main() {

    banner();
    
    get_user_info();

    puts("[!] There are no places available for non VIP users and you don't figure as one.");
}

i tried:
python2 -c “print 32 * b’A’ + ‘x00x00x00x00x00x00x00x00’ + ‘xa7x11x40x00x00x00x00x00′” > output9.txt
where xa7x11x40x00x00x00x00x00 is the address where the function vip_queue is stored at
and also:
python2 -c “print 36 * b’A’ + ‘xa7x11x40x00x00x00x00x00′” > output8.txt
python2 -c “print 32 * b’A’ + 4 * b’0′ + ‘xa7x11x40x00x00x00x00x00′” > output7.txt
python2 -c “print 32 * b’A’ + ‘x00x00x00x00’ + ‘xa7x11x40x00x00x00x00x00′” > output78