diff --git a/Answers/40230212010/.vscode/settings.json b/Answers/40230212010/.vscode/settings.json
new file mode 100644
index 0000000..e112a70
--- /dev/null
+++ b/Answers/40230212010/.vscode/settings.json
@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}
diff --git a/Answers/40230212010/README.md b/Answers/40230212010/README.md
new file mode 100644
index 0000000..7c03a53
--- /dev/null
+++ b/Answers/40230212010/README.md
@@ -0,0 +1,18 @@
+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).
diff --git a/Answers/40230212010/src/Admin.java b/Answers/40230212010/src/Admin.java
new file mode 100644
index 0000000..56edd73
--- /dev/null
+++ b/Answers/40230212010/src/Admin.java
@@ -0,0 +1,10 @@
+public class Admin extends User{
+    public static final String password="123";
+    public Admin(String name,String phoneNumber,String password) {
+        super( name, phoneNumber);
+        
+    }
+    
+    
+
+}
diff --git a/Answers/40230212010/src/App.java b/Answers/40230212010/src/App.java
new file mode 100644
index 0000000..3ecbb62
--- /dev/null
+++ b/Answers/40230212010/src/App.java
@@ -0,0 +1,169 @@
+import java.lang.reflect.Array;
+import java.util.*;
+
+public class App {
+    public static void main(String[] args) throws Exception {
+        Scanner scanner = new Scanner(System.in);
+        Library library = new Library("Main Library", 1000, "9am to 5pm");
+
+        System.out.println("Welcome to " + library.getName() + "!");
+        System.out.println("Current capacity: " + library.getCapacity());
+        System.out.println("Operating hours: " + library.getOperatingHours());
+        User user = new User(null, null);
+        boolean exit = false;
+        boolean exit2 = false;
+        boolean exit3 = false;
+
+        while (!exit3) {
+            while (!exit) {
+                System.out.println("Choose your role:");
+                System.out.println("1. Admin");
+                System.out.println("2. Normal User");
+                System.out.println("3. Register");
+                System.out.println("4. exit.");
+                int choice2 = Integer.parseInt(scanner.nextLine());
+                switch (choice2) {
+                    case 1:
+                        System.out.println("Enter Password:");
+                        String password = scanner.nextLine();
+                        if (password.equals(Admin.password)) {
+                            exit = true;
+                        } else {
+                            System.out.println("Wrong Password!");
+                        }
+                        break;
+                    case 2:
+                        System.out.println("Enter your name:");
+                        String name = scanner.nextLine();
+                        System.out.println("Enter Password:");
+                        String pass2 = scanner.nextLine();
+                        if (name.equals(User.name)) {
+                            if (pass2.equals(User.password)) {
+                                exit = true;
+                            }
+                        }
+                        break;
+                    case 3:
+                        System.out.println("Enter your name:");
+                        String name1 = scanner.nextLine();
+                        System.out.println("Enter your Phone Number:");
+                        String phoneNumber = scanner.nextLine();
+                        System.out.println("Enter Password:");
+                        String password3 = scanner.nextLine();
+                        user = new User(name1, phoneNumber);
+                        User.password = password3;
+                        exit = true;
+                        break;
+                    case 4:
+                        System.out.println("thank you...");
+                        exit3=true;
+                        System.exit(0);
+                        break;
+                    default:
+                        System.out.println("Invalid choice.");
+                        break;
+                }
+
+            }
+            exit=false;
+
+            while (!exit2) {
+
+                System.out.println("\nChoose an option:");
+                System.out.println("1. Add book");
+                System.out.println("2. Get hours");
+                System.out.println("3. Rent book");
+                System.out.println("4. Add member");
+                System.out.println("5. Remove member");
+                System.out.println("6. Return book");
+                System.out.println("7. Get available books");
+                System.out.println("8. Back to main menu.");
+
+                int choice = scanner.nextInt();
+                scanner.nextLine();
+
+                switch (choice) {
+                    case 1:
+                        System.out.print("Enter book title: ");
+                        String title = scanner.nextLine();
+                        System.out.print("Enter book author: ");
+                        String author = scanner.nextLine();
+                        System.out.print("Enter book description: ");
+                        String description = scanner.nextLine();
+                        library.addBook(title, author, description);
+                        System.out.println("Book added successfully.");
+                        break;
+                    case 2:
+                        System.out.println("Operating hours: " + library.getOperatingHours());
+                        break;
+                    case 3:
+                        System.out.print("Enter book name: ");
+                        String bookName = scanner.nextLine();
+
+                        System.out.print("Enter student ID: ");
+                        String UniqueID = scanner.nextLine();
+                        library.rentBook(bookName, user);
+                        // NormalUser users = library.getNormalUser(UniqueID);
+                        // if (user == null) {
+                        // System.out.println("User not found.");
+                        // } else {
+                        // library.rentBook(bookName, user);
+                        // }
+                        break;
+                    case 4:
+                        System.out.print("Enter Admin Name: ");
+                        UniqueID = scanner.nextLine();
+                        System.out.print("Enter password: ");
+                        String passwordd = scanner.nextLine();
+
+                        if (passwordd == Admin.password) {
+                            System.out.print("Enter new member name: ");
+                            String newName = scanner.nextLine();
+                            System.out.print("Enter new member phone number: ");
+                            String phoneNumber = scanner.nextLine();
+                            library.addNormalUser(newName, UniqueID, phoneNumber);
+                            System.out.println("New member added successfully.");
+                        } else {
+
+                            System.out.println("Invalid password.");
+                        }
+                        break;
+                    case 5:
+                        System.out.print("Enter member ID: ");
+                        String memberID = scanner.nextLine();
+                        library.removeUser(memberID);
+                        System.out.println("Member removed successfully.");
+                        break;
+                    case 6:
+                        System.out.print("Enter book name: ");
+                        String bookToReturnName = scanner.nextLine();
+                        Book booktoReturn = library.findBookByName(bookToReturnName);
+                        library.returnBook(user, booktoReturn);
+                        break;
+                    case 7:
+                        ArrayList<Book> availableBooks = library.getAvailableBooks();
+                        if (availableBooks.isEmpty()) {
+                            System.out.println("No books available.");
+                        } else {
+                            System.out.println("Available books:");
+                            for (Book book : availableBooks) {
+                                System.out.println("- " + book.getTitle() + " by " + book.getAuthor());
+                            }
+                        }
+                        break;
+                    case 8:
+                        System.out.println("Exiting...");
+                        exit2 = true;
+                        break;
+                    default:
+                        System.out.println("Invalid choice..");
+                }
+
+            }
+            exit2=false;
+
+
+        }
+
+    }
+}
diff --git a/Answers/40230212010/src/Book.java b/Answers/40230212010/src/Book.java
new file mode 100644
index 0000000..b9a17d8
--- /dev/null
+++ b/Answers/40230212010/src/Book.java
@@ -0,0 +1,63 @@
+
+public class Book {
+    private static int i=0;
+    private final String bookID;
+    private String title;
+    private String description;
+    private String author;
+    private boolean isAvailable;
+    public Book ( String title, String description, String author){
+        this.author=author;
+        this.title=title;
+        this.description=description;
+        i++;
+        this.bookID=String.valueOf(i);
+        this.isAvailable=true;
+    }
+ 
+    public String getBookID() {
+        return bookID;
+    }
+    public boolean isAvailable() {
+        return isAvailable;
+    }
+    public boolean setAvailable(boolean isAvailable) {
+        return isAvailable;
+    }
+
+    public static int getI() {
+        return i;
+    }
+
+    public static void setI(int i) {
+        Book.i = i;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+    
+    
+ 
+    
+}
diff --git a/Answers/40230212010/src/Library.java b/Answers/40230212010/src/Library.java
new file mode 100644
index 0000000..73173b1
--- /dev/null
+++ b/Answers/40230212010/src/Library.java
@@ -0,0 +1,194 @@
+import java.time.LocalDate;
+import java.util.*;
+import java.lang.*;;
+
+public class Library {
+    private User user;
+    private String name;
+    private int capacity;
+    private String operatingHours;
+    private Map<String, Book> books;
+    private List<User> users;
+    private List<Rent> rentals;
+    private List<Admin> adminsList;
+    private List<NormalUser> normalUsersList;
+
+    public Library(String name, int capacity, String operatingHours) {
+        this.name = name;
+        this.capacity = capacity;
+        this.operatingHours = operatingHours;
+        this.books = new HashMap<>();
+        this.users = new ArrayList<>();
+        this.rentals = new ArrayList<>();
+        List<User> normalUsersList = new ArrayList<User>();
+        List<Admin> admins = new ArrayList<Admin>();
+    }
+
+    public void addBook(String title, String description, String author) {
+
+        if (this.books.containsValue(new Book(title, description, author))) {
+            System.out.println("This book already exists in the library.");
+            return;
+        }
+
+        Book book = new Book(title, description, author);
+        this.books.put(book.getBookID(), book);
+        System.out.println("Book added successfully.");
+    }
+
+    public void removebook(String bookID) {
+        this.books.remove(bookID);
+    }
+
+    public Book getBooks(String bookID) {
+
+        return books.get(bookID);
+    }
+
+    public ArrayList<Book> getAvailableBooks() {
+        ArrayList<Book> Availablebooks = new ArrayList<>();
+        for (Book book : books.values()) {
+            if (book.isAvailable()) {
+                Availablebooks.add(book);
+            }
+        }
+        return Availablebooks;
+    }
+
+    public void rentBook(String bookName, User user) {
+
+        Book book = this.books.get(bookName);
+
+        if (book == null) {
+            System.out.print("book not found: " + bookName);
+        }
+
+        if (!book.isAvailable()) {
+            System.out.println("Book is currently unavailable: " + bookName);
+        }
+
+        String rentalID = UUID.randomUUID().toString().substring(0, 8);
+
+        LocalDate rentalDate = LocalDate.now();
+        LocalDate dueDate = rentalDate.plusDays(7);
+
+        Rent newRent = new Rent(rentalID, rentalDate, dueDate, book, user);
+        rentals.add(newRent);
+
+        book.setAvailable(false);
+
+        System.out.println("Book rented successfully. Your due date is: " + dueDate);
+
+    }
+
+    public Book findBookByName(String bookName) {
+       return books.get(bookName);
+    }
+    
+    public void removeUser(String userID) {
+        for (NormalUser user : normalUsersList) {
+            if (user.getUniqueID()== userID) {
+                normalUsersList.remove(userID);
+            }
+
+            for (Admin admin : adminsList) {
+                if (user.getUniqueID() == userID) {
+                    adminsList.remove(user.getUniqueID());
+                }
+            }
+        }
+    }
+
+    
+
+    public void addAdmin(String name, String phoneNumber, String password) {
+        Admin newAdmin = new Admin(name, phoneNumber, password);
+        adminsList.add(newAdmin);
+    }
+
+    public void addNormalUser(String name, String phoneNumber, String registrationDate) {
+        NormalUser newNormalUser = new NormalUser(name, phoneNumber, registrationDate);
+        normalUsersList.add(newNormalUser);
+    }
+
+    public NormalUser getNormalUser(String UniqueID) {
+        for (NormalUser user : normalUsersList) {
+            if (user.getUniqueID().equals(UniqueID) ) {
+                return user;
+            }
+        }
+        return null;
+    }
+
+    public Admin getAdmin(String password) {
+        for (Admin admin : adminsList) {
+            if (admin.getPassword().equals(password)) {
+                return admin;
+            }
+        }
+        return null;
+    }
+
+
+    public void returnBook (User user, Book book) {
+        if (book.isAvailable()) {
+            Rent rent = new Rent(name, null, null, book, null);
+            rentals.add(rent);
+            book.setAvailable(false);
+            System.out.println("book returned successfully!");
+        }
+        else{
+            System.out.println("not available!");
+        }
+
+    }
+    
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getCapacity() {
+        return capacity;
+    }
+
+    public void setCapacity(int capacity) {
+        this.capacity = capacity;
+    }
+
+    public String getOperatingHours() {
+        return operatingHours;
+    }
+
+    public void setOperatingHours(String operatingHours) {
+        this.operatingHours = operatingHours;
+    }
+
+    public Map<String, Book> getBooks() {
+        return books;
+    }
+
+    public void setBooks(Map<String, Book> books) {
+        this.books = books;
+    }
+
+    public List<User> getUsers() {
+        return users;
+    }
+
+    public void setUsers(List<User> users) {
+        this.users = users;
+    }
+
+    public List<Rent> getRentals() {
+        return rentals;
+    }
+
+    public void setRentals(List<Rent> rentals) {
+        this.rentals = rentals;
+    }
+
+}
diff --git a/Answers/40230212010/src/NormalUser.java b/Answers/40230212010/src/NormalUser.java
new file mode 100644
index 0000000..c69001a
--- /dev/null
+++ b/Answers/40230212010/src/NormalUser.java
@@ -0,0 +1,20 @@
+public class NormalUser extends User {
+
+    private String registrationDate;
+
+    public NormalUser(String name,String phoneNumber,String registrationDate) {
+        super( name,  phoneNumber);
+        this.registrationDate=registrationDate;
+    }
+
+
+    public String getRegistrationDate() {
+        return registrationDate;
+    }
+    public void setRegistrationDate(String registrationDate) {
+        this.registrationDate = registrationDate;
+    }
+    
+
+    
+}
diff --git a/Answers/40230212010/src/Rent.java b/Answers/40230212010/src/Rent.java
new file mode 100644
index 0000000..d6c8ec8
--- /dev/null
+++ b/Answers/40230212010/src/Rent.java
@@ -0,0 +1,47 @@
+import java.time.LocalDate;
+
+public class Rent {
+    private static int count=0;
+    private final String rentID ;
+    private LocalDate rentalDate;
+    private LocalDate dueDate; 
+    
+    private Book book;
+    private User user;
+    public Rent(String rentalID,LocalDate rentalDate,LocalDate dueDate, Book book, User user) {
+        this.rentalDate = rentalDate;
+        this.book = book;
+        this.user = user;
+        this.rentID=String.valueOf(++count);
+    }
+    public static int getCount() {
+        return count;
+    }
+    public static void setCount(int count) {
+        Rent.count = count;
+    }
+    public String getRentID() {
+        return rentID;
+    }
+    public LocalDate getRentalDate() {
+        return rentalDate;
+    }
+    public void setRentalDate(LocalDate rentalDate) {
+        this.rentalDate = rentalDate;
+    }
+    public Book getBook() {
+        return book;
+    }
+    public void setBook(Book book) {
+        this.book = book;
+    }
+    public User getUser() {
+        return user;
+    }
+    public void setUser(NormalUser user) {
+        this.user = user;
+    }
+   
+    
+
+}
diff --git a/Answers/40230212010/src/User.java b/Answers/40230212010/src/User.java
new file mode 100644
index 0000000..33fd420
--- /dev/null
+++ b/Answers/40230212010/src/User.java
@@ -0,0 +1,54 @@
+import java.util.*;
+
+public class User {
+    private static int count = 0;
+    public static String name;
+    private final String UniqueID;
+    private String phoneNumber;
+    
+    public static  String password;
+
+    public User(String name, String phoneNumber) {
+        this.UniqueID = String.valueOf( ++count);
+        this.phoneNumber = phoneNumber;
+
+    }
+
+    public String getUniqueID() {
+        return UniqueID;
+    }
+
+    public static int getCount() {
+        return count;
+    }
+
+    public static void setCount(int count) {
+        User.count = count;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPhoneNumber() {
+        return phoneNumber;
+    }
+
+    public void setPhoneNumber(String phoneNumber) {
+        this.phoneNumber = phoneNumber;
+    }
+
+    public static String getPassword() {
+        return password;
+    }
+
+    public static void setPassword(String password) {
+        User.password = password;
+    }
+    
+
+}