wubbawubbadubdub

typedef void* any_t;

struct _XORListNode {
    any_t data;
    unsigned long link;
};


_XORListNode* insert_node(_XORListNode* last){
    _XORListNode *node = (_XORListNode*)malloc(sizeof(_XORListNode));

    if(last == NULL){   // Create head and return it
        node->link = 0;
        return node;
    }

    node->link = (unsigned long)last;
    last->link = last->link ^ (unsigned long) node;
}


// B            A+C (=b)            B+D(=c)         C