帮助重构

我为我公司的 Java 后端职位空缺编写了一个测试，以下是包含任务的文档文本：

User ManagProject 标题：图书馆管理系统 该项目旨在创建一个图书馆管理系统，这是一个帮助图书馆工作人员以简单有效的方式管理图书、顾客（图书馆用户）和图书借阅的软件工具。
主要功能： ement：创建和管理图书管理员帐户。允许图书馆员登录。

Book Management:
    Add new books with details like title, author, ISBN, and genre.
    Edit and update book info.
    Remove books from the library.
    Display a list of all library books.

Patron Management:
    Add new patrons with their names, contact info, and membership status.
    Edit and update patron details.
    Remove patrons from the library.
    Show a list of all library patrons.

Borrowing System:
    Enable library patrons to borrow books.
    Track due dates for borrowed books.
    Allow librarians to mark books as returned.
    Notify patrons if they have overdue books.

Search and Filtering:
    Create a search feature for books and patrons based on criteria like title, author, and name.
    Add options to sort and filter lists of books and patrons.

Reporting:
    Generate reports that display overdue books and transaction history.
    Provide statistics about the library's book collection and patron activity.   Technical Details:

User Interface:
    Design an easy-to-use web-based interface for librarians.
    Ensure it works well on different screen sizes.

Security:
    Set up user login and access control for librarians.
    Safeguard sensitive information, like passwords and patron data.

Database:
    Use a relational database (e.g., MySQL, PostgreSQL) to store book, patron, and transaction data.
    Create a suitable database structure and relationships.

Performance:
    Optimize how the system fetches data from the database.
    Ensure the system can handle multiple users at once.

Scalability:
    Design the system to grow smoothly as the library's needs expand.   Technology Stack:

Backend: Java (with Spring Boot)
Frontend: HTML, CSS, JavaScript
Database: Relational (e.g., MySQL, PostgreSQL)
Security: Spring Security
Database Access: Hibernate
User Interface Templating: Thymeleaf or similar   Project Deliverables:

The project's source code.
Documentation (README) explaining how to set up and run the application.
Brief documentation describing the project's structure and design choices.
Source code should be provided as a git repository.   Evaluation Criteria:   The project will be assessed based on:

Functionality: Does the system meet all functional requirements?
User Interface: Is the interface user-friendly and adaptable to different devices?
Code Quality: Is the code well-organized, readable, and maintainable?
Security: Is user authentication and data protection implemented correctly?
Database Design: Does the database structure fit the project's needs?
Documentation: Is there clear documentation for setting up and using the application?
Error Handling: Does the application handle errors gracefully?
Performance: How efficiently does the application perform its tasks?

通过测试后，他们说很明显“是我自己写的”（确实如此）并告诉我改正然后再试，但不幸的是他们没有告诉我任务到底出了什么问题。我自己找不到具体需要纠正的地方，如果您能告诉我，我会很高兴这是Github上该项目的链接。