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

struct thing_v1 {
    char version[1];
    int  datasize;
    char *data;
}

struct thing_v2 {
    char version[1];
    int  datasize;
    char *data;
    int  moredatasize;
    char *moredata;
}

int
main(int argc, const char *argv[])
{
    
    return 0;
}