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

typedef unsigned long long ull_t;
const ull_t SIZE = (1UL << 3);

typedef struct
{
    int foo;
    int len;
    int boo;
} str_t;

int main()
{
    str_t *ptr = malloc(sizeof(str_t) * 2);
    ptr[0].len = 10;
    ptr[1].len = 22;

    ptr++;

    --ptr->len;

    printf("%i", ptr -> len);
}