Book* initBooksList(Book *p){
	char book_name_buffer[MAX_ROW];
	FILE *fp = fopen("books.txt","r");
	if (fp == NULL)
		exit(0);
	char str[MAX_ROW];
	int actual_len = 0;
	while (NULL != fgets(str, MAX_ROW, fp)){
		if (p == NULL){
			p == (Book*)malloc(sizeof(Book));
			for (int i = 0; i+1 != '$'; i++){
				book_name_buffer[i] = str[i];
				actual_len += 1;
			}
			strcpy(p->name,book_name_buffer);
			p->next == NULL;
			int cpy = 0;
			for (int i = actual_len+5; i != ' '; i++){
				cpy = cpy * 10 + int(str[i]);
			}
			p->copies = cpy;
		}
		else{
			Book* init = p;
			Book* buffer = NULL;
			Book* new_book = NULL;
			new_book == (Book*)malloc(sizeof(Book));
			for (int i = 0; i + 1 != '$'; i++){
				book_name_buffer[i] = str[i];
				actual_len += 1;
			}
			strcpy(new_book->name, book_name_buffer);
			int cpy = 0;
			for (int i = actual_len + 5; i != ' '; i++){
				cpy = cpy * 10 + int(str[i]);
			}
			new_book->copies = cpy;
			while (p!= NULL && strcmp(new_book->name, p->name) < 0){
				buffer = p;
				p = p->next;
			}
			if (p == NULL){
				buffer->next = new_book;
				new_book->next = NULL;
				p = init;
			}
			else{
				buffer->next = new_book;
				new_book->next = p;
				p = init;
			}
		}
	}
	fclose(fp);
	return p;
}