constexpr char* char_cast(void* ptr) {
    return static_cast<char*>(x);
}

constexpr void* move_addr(void* ptr, value) {
    return static_cast<void*>(char_cast(x) + value);
}

constexpr size_t* size_cast(void* x) {
    return static_cast<size_t*>(x);
}

void cln_mem(void *ptr, size_t len)
{
   constexpr size_t size = siezof(size_t);
   while(len > size) {
        *size_cast(ptr) = 0;
        len -= size;
        ptr = move_addr(ptr, size);
   }

    while(len)
    {
        *char_cast(ptr) = 0;
        ptr = move_addr(ptr, 1);
        len--;
    }
}