void insert_node(struct node *head, int data, int index){
struct node* new_node = create_node(data);
struct node* temp = head;
int i = 0;
while (1){
if (index == i){
break;
}
temp = temp->next;
i ++;
}
if (index == 0){
new_node->next = head;
head->prev = new_node;
}
else{
new_node->next = temp;
new_node->prev = temp->prev;
temp->prev->next = new_node;
temp->prev = new_node;
}
}
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