小甲鱼视频讲的单链表头插法例子的问题

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

struct Book
{
	char title[128];
	char author[40];
	struct Book *next;                       
};
void getInput(struct Book *book)
{
	printf("请输入书名：");
	scanf_s("%s", book->title,127);
	printf("请输入作者：");
	scanf_s("%s", book->author,39);
}
void addBook(struct Book **library)           //main函数中把library的地址传过来，但这里函数的参数定义是指针，二级指针
{
	struct Book *book, *temp;              //这里创造两个指向结构体book的指针
	book = (struct Book *)malloc(sizeof(struct Book));                
		getInput(book);
	if (*library != NULL)
	{
		temp = *library;
		*library = book;
		book->next = temp;
	}

	else
	{
		*library = book;
		book->next = NULL;
	 }
}

void printLibrary(struct Book*library)
{
	struct Book *book;
	int count = 1;
	book = library;
	while (book != NULL)
	{
		printf("Book%d:", count);
		printf("书名：%s", book->title);
		printf("作者：%s", book->author);
		book = book->next; count++;
	}
}
	void releaseLibrary(struct Book *library)
	{
		while (library != NULL)
		{
			library = library->next; free(library);
		}
	}
	int main()
	{
		struct Book *library = NULL;             
			addBook(&library);
		printLibrary(library);
	}