void list_insert(node** head, char* s)
{
	node* n = list_new();
	n->string = s;
	n->next = NULL;

	if (*head == NULL) {
		*head = n;
		return;
	}

	node* tmp = *head;

	while (tmp->next != NULL) {
		tmp = tmp->next;
	}

	tmp->next = n;
}