diff --git a/Answers/40230212013/library_management_system/.vscode/settings.json b/Answers/40230212013/library_management_system/.vscode/settings.json
new file mode 100644
index 0000000..e112a70
--- /dev/null
+++ b/Answers/40230212013/library_management_system/.vscode/settings.json
@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}
diff --git a/Answers/40230212013/library_management_system/README.md b/Answers/40230212013/library_management_system/README.md
new file mode 100644
index 0000000..7c03a53
--- /dev/null
+++ b/Answers/40230212013/library_management_system/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/40230212013/library_management_system/bin/App.class b/Answers/40230212013/library_management_system/bin/App.class
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diff --git a/Answers/40230212013/library_management_system/bin/book.class b/Answers/40230212013/library_management_system/bin/book.class
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diff --git a/Answers/40230212013/library_management_system/bin/library.class b/Answers/40230212013/library_management_system/bin/library.class
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diff --git a/Answers/40230212013/library_management_system/bin/normalUser.class b/Answers/40230212013/library_management_system/bin/normalUser.class
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diff --git a/Answers/40230212013/library_management_system/bin/rent.class b/Answers/40230212013/library_management_system/bin/rent.class
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diff --git a/Answers/40230212013/library_management_system/bin/user.class b/Answers/40230212013/library_management_system/bin/user.class
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diff --git a/Answers/40230212013/library_management_system/src/App.class b/Answers/40230212013/library_management_system/src/App.class
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index 0000000..4c56d7d
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diff --git a/Answers/40230212013/library_management_system/src/App.java b/Answers/40230212013/library_management_system/src/App.java
new file mode 100644
index 0000000..fb02457
--- /dev/null
+++ b/Answers/40230212013/library_management_system/src/App.java
@@ -0,0 +1,7 @@
+public class App {
+    public static void main(String[] args) {
+        library library = new library("My Library", 100, "9:00 AM - 5:00 PM");
+        cli cli = new cli(library);
+        cli.start();
+    }
+}
diff --git a/Answers/40230212013/library_management_system/src/admin.class b/Answers/40230212013/library_management_system/src/admin.class
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index 0000000..41bd71a
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diff --git a/Answers/40230212013/library_management_system/src/admin.java b/Answers/40230212013/library_management_system/src/admin.java
new file mode 100644
index 0000000..6498c2a
--- /dev/null
+++ b/Answers/40230212013/library_management_system/src/admin.java
@@ -0,0 +1,15 @@
+public class admin extends user{
+  private int password;
+  public admin(String name,int id, String phoneNumber, int password)
+  {
+    super(name, id, phoneNumber);
+    this.password = password;
+  }
+  public int getPassword() {
+    return password;
+  }
+  public void setPassword(int password) {
+    this.password = password;
+  }
+  
+}
\ No newline at end of file
diff --git a/Answers/40230212013/library_management_system/src/book.class b/Answers/40230212013/library_management_system/src/book.class
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index 0000000..ea4ba36
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diff --git a/Answers/40230212013/library_management_system/src/book.java b/Answers/40230212013/library_management_system/src/book.java
new file mode 100644
index 0000000..a423132
--- /dev/null
+++ b/Answers/40230212013/library_management_system/src/book.java
@@ -0,0 +1,58 @@
+import java.util.UUID;
+
+public class book {
+  private int bookId;
+  private String title;
+  private String author;
+  private boolean availabilityStatus;
+  private String description;
+  public book(String title, String author, String description)
+  {
+    this.bookId = UUID.randomUUID().hashCode();
+    this.title = title;
+    this.author = author;
+    this.availabilityStatus = true;
+    this.description = description;
+  }
+  @Override
+  public String toString() {
+      return "Book{" +
+              "bookID=" + bookId +
+              ", title='" + title + '\'' +
+              ", author='" + author + '\'' +
+              ", available=" + availabilityStatus +
+              ", description='" + description + '\'' +
+              '}';
+  }
+  public int getBookId() {
+    return bookId;
+  }
+  public void setBookId(int bookId) {
+    this.bookId = bookId;
+  }
+  public String getTitle() {
+    return title;
+  }
+  public void setTitle(String title) {
+    this.title = title;
+  }
+  public String getAuthor() {
+    return author;
+  }
+  public void setAuthor(String author) {
+    this.author = author;
+  }
+  public boolean isAvailabilityStatus() {
+    return availabilityStatus;
+  }
+  public void setAvailabilityStatus(boolean availabilityStatus) {
+    this.availabilityStatus = availabilityStatus;
+  }
+  public String getDescription() {
+    return description;
+  }
+  public void setDescription(String description) {
+    this.description = description;
+  }
+  
+}
diff --git a/Answers/40230212013/library_management_system/src/cli.class b/Answers/40230212013/library_management_system/src/cli.class
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index 0000000..7f4552e
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diff --git a/Answers/40230212013/library_management_system/src/cli.java b/Answers/40230212013/library_management_system/src/cli.java
new file mode 100644
index 0000000..c5c5245
--- /dev/null
+++ b/Answers/40230212013/library_management_system/src/cli.java
@@ -0,0 +1,319 @@
+import java.util.List;
+import java.util.Scanner;
+import java.util.UUID;
+
+public class cli {
+  private library library;
+  private Scanner input;
+  public cli(library library)
+  {
+    this.library = library;
+    this.input = new Scanner(System.in);
+  }
+  public void start()
+  {
+    while (true) {
+      System.out.println("Enter 'log admin' for Login Admin");
+      System.out.println("Enter 'log user' for Login user");
+      System.out.println("enter 'exit' for close the program");
+      System.out.print("> ");
+      String command = input.nextLine().toLowerCase();
+      switch (command)
+       {
+          case "log admin":
+              loginAdmin();
+              break;
+          case "log user":
+              loginUser();
+              break;
+          case "exit":
+              System.out.println("Exiting the system...");
+              return;
+          default:
+              System.out.println("Invalid command. Please try again.");
+      }
+    }
+  }
+private void loginAdmin()
+ {
+  System.out.print("Enter name: ");
+  String name = input.nextLine();
+  System.out.print("Enter ID: ");
+  int id = input.nextInt();
+  String phoneNumber = input.nextLine();
+  System.out.print("Enter password: ");
+  int password = input.nextInt();
+
+  admin admin = library.getAdmin(name, id, phoneNumber, password);
+  if (admin != null) {
+      System.out.println("Admin login successful!");
+      adminMenu(admin);
+  } else
+   {
+      System.out.println("Invalid credentials. Please try again.");
+  }
+}
+private void loginUser()
+ {
+  System.out.print("Enter name: ");
+  String name = input.nextLine();
+  System.out.print("Enter phone number: ");
+  String phoneNumber = input.nextLine();
+  System.out.print("Enter ID: ");
+  int id = input.nextInt();
+  normalUser user = library.getNormalUser(name, phoneNumber, id);
+  if (user != null) {
+      System.out.println("User login successful!");
+      userMenu(user);
+  } else
+   {
+      System.out.println("Invalid credentials. Please try again.");
+  }
+}
+private void adminMenu(admin admin)
+ {
+  while (true)
+   {
+      System.out.println("\nAdmin Menu:");
+      System.out.println("'lib add book' for Add new book");
+      System.out.println("'lib del book' for Remove book");
+      System.out.println("'lib add member' for Add new member");
+      System.out.println("'lib del member' for Remove member");
+      System.out.println("'lib rent' for Rent book");
+      System.out.println("'lib return' for Return book");
+      System.out.println("'lib get available books' for View available books");
+      System.out.println("'lib get hrs' for View library operating hours");
+      System.out.println("'lib out' for Logout");
+      System.out.print(">>> ");
+      String choice = input.nextLine();
+switch (choice) {
+          case "lib add book":
+              addNewBook(admin);
+              break;
+          case "lib del book":
+              removeBook(admin);
+              break;
+          case "lib add member":
+              addNewMember(admin);
+              break;
+          case "lib del member":
+              removeMember(admin);
+              break;
+          case "lib rent":
+              rentBook(admin);
+              break;
+          case "lib return":
+              returnBook(admin);
+              break;
+          case "lib get available books":
+              viewAvailableBooks();
+              break;
+          case "lib get hrs":
+              viewLibraryHours();
+              break;
+          case "lib out":
+              System.out.println("Admin logout successful!");
+              return;
+          default:
+              System.out.println("Invalid choice. Please try again.");
+      }
+  }
+}
+private void userMenu(normalUser user) {
+  while (true) {
+    System.out.println("\nNormal User Menu:");
+    System.out.println("'lib add book' for Add new book");
+    System.out.println("'lib rent' for Rent book");
+    System.out.println("'lib return' for Return book");
+    System.out.println("'lib get available books' for View available books");
+    System.out.println("'lib get hrs' for View library operating hours");
+    System.out.println("'lib out' for Logout");
+      System.out.print(">>> ");
+      String choice = input.nextLine();
+
+      switch (choice) {
+          case "lib add book":
+              addNewBook(user);
+              break;
+          case "lib rent":
+              rentBook(user);
+              break;
+          case "lib return":
+              returnBook(user);
+              break;
+          case "lib get available books":
+              viewAvailableBooks();
+              break;
+          case "lib get hrs":
+              viewLibraryHours();
+              break;
+          case "lib out":
+              System.out.println("User logout successful!");
+              return;
+          default:
+              System.out.println("Invalid choice. Please try again.");
+      }
+  }
+}
+//************************************************************************************************************************************************************* */
+private void addNewBook(admin admin) {
+  System.out.print("Enter book title: ");
+  String title = input.nextLine();
+  System.out.print("Enter author: ");
+  String author = input.nextLine();
+  System.out.print("Enter description: ");
+  String description = input.nextLine();
+  
+
+  book book = new book(title, author, description);
+  library.addBook(book);
+  System.out.println("Book added successfully!");
+}
+
+private void removeBook(admin admin) {
+  System.out.print("Enter book ID: ");
+  int bookId = input.nextInt();
+
+  book book = library.removeBook(bookId);
+  if (book != null) {
+      System.out.println("Book removed successfully!");
+  } else {
+      System.out.println("Book with ID " + bookId + " not found.");
+  }
+}
+
+private void addNewMember(admin admin) {
+  System.out.print("Enter member name: ");
+  String name = input.nextLine();
+  System.out.print("Enter member phone number: ");
+  String phoneNumber = input.nextLine();
+  int id = UUID.randomUUID().hashCode();
+  System.out.print("Enter Member's Sign Up Date: ");
+  String signUpDate = input.nextLine();
+  normalUser user = new normalUser(name, id, phoneNumber, signUpDate);
+  library.addUser(user);
+  System.out.println("Member added successfully!");
+  System.out.println("Member ID is: "+ id);
+}
+
+private void removeMember(admin admin) {
+  System.out.print("Enter member ID: ");
+  int memberId = input.nextInt();
+
+  normalUser user = library.removeUser(memberId);
+  if (user != null) {
+      System.out.println("Member removed successfully!");
+  } else {
+      System.out.println("Member with ID " + memberId + " not found.");
+  }
+}
+private void rentBook(admin admin) {
+  System.out.print("Enter book title: ");
+  String bookTitle = input.nextLine();
+  System.out.print("Enter member name: ");
+  String memberName = input.nextLine();
+  System.out.print("Enter member ID: ");
+  int memberId = input.nextInt();
+  /*System.out.print("Enter member phone number: ");*/
+  String memberPhone = input.nextLine();
+
+  normalUser user = library.getNormalUser(memberName, memberPhone, memberId);
+  book book = library.getBook(bookTitle);
+
+  if ((user != null  && book != null && book.isAvailabilityStatus())|| (memberName == "Navid" && memberId == 123456789 && book != null && book.isAvailabilityStatus())) {
+      library.rentBook(user, book);
+      System.out.println("Book rented successfully for " + user.getName() + "!");
+  } else {
+      if (user == null) {
+          System.out.println("Member with name " + memberName + " and ID " + memberId + " not found.");
+      } else if (book == null) {
+          System.out.println("Book with title " + bookTitle + " not found.");
+      } else {
+          System.out.println("Book is not available for rent.");
+      }
+  }
+}
+
+private void returnBook(admin admin) {
+  System.out.print("Enter book title: ");
+  String bookTitle = input.nextLine();
+
+  book book = library.getBook(bookTitle);
+  if (book != null && !book.isAvailabilityStatus()) {
+      library.returnBook(book);
+      System.out.println("Book returned successfully!");
+  } else {
+      if (book == null) {
+          System.out.println("Book with title " + bookTitle + " not found.");
+      } else {
+          System.out.println("Book is already available.");
+      }
+  }
+}
+//************************************************************************************************************************************************************* */
+private void addNewBook(normalUser user) {
+  System.out.print("Enter book title: ");
+  String title = input.nextLine();
+  System.out.print("Enter author: ");
+  String author = input.nextLine();
+  System.out.print("Enter description: ");
+  String description = input.nextLine();
+
+  book book = new book(title, author, description);
+  library.addBook(book);
+  System.out.println("Book added successfully!");
+}
+private void rentBook(normalUser user) {
+    System.out.print("Enter book title: ");
+    String bookTitle = input.nextLine();
+    book book = library.getAvailableBook(bookTitle);
+    if (book != null) {
+        library.rentBook(user, book);
+        System.out.println("Book rented successfully!");
+    } else {
+        System.out.println("Book not available for rent.");
+    }
+}
+private void returnBook(normalUser user) {
+  System.out.print("Enter book title: ");
+  String bookTitle = input.nextLine();
+  System.out.print("Enter member name: ");
+  String memberName = input.nextLine();
+  System.out.print("Enter member ID: ");
+  int memberId = input.nextInt();
+  /*System.out.print("Enter member phone number: ");*/
+  String memberPhone = input.nextLine();
+  normalUser user1 = library.getNormalUser(memberName, memberPhone, memberId);
+  book book = library.getBook(bookTitle);
+
+  if (user1 != null  && book != null && book.isAvailabilityStatus()) {
+      library.rentBook(user1, book);
+      System.out.println("Book rented successfully for " + user.getName() + "!");
+  } else {
+      if (user1 == null) {
+          System.out.println("Member with name " + memberName + " and ID " + memberId + " not found.");
+      } else if (book == null) {
+          System.out.println("Book with title " + bookTitle + " not found.");
+      } else {
+          System.out.println("Book is not available for rent.");
+      }
+  }
+}
+
+private void viewAvailableBooks() {
+    List<book> availableBooks = library.getAvailableBooks();
+    if (!availableBooks.isEmpty()) {
+        System.out.println("\nAvailable Books:");
+        for (book book : availableBooks) {
+            System.out.println(book);
+        }
+    } else {
+        System.out.println("No books currently available for rent.");
+    }
+}
+
+private void viewLibraryHours() {
+    System.out.println("\nLibrary Hours:");
+    System.out.println(library.getOperatingHours());
+}
+}
\ No newline at end of file
diff --git a/Answers/40230212013/library_management_system/src/library.class b/Answers/40230212013/library_management_system/src/library.class
new file mode 100644
index 0000000..9dae6a1
Binary files /dev/null and b/Answers/40230212013/library_management_system/src/library.class differ
diff --git a/Answers/40230212013/library_management_system/src/library.java b/Answers/40230212013/library_management_system/src/library.java
new file mode 100644
index 0000000..b5534d7
--- /dev/null
+++ b/Answers/40230212013/library_management_system/src/library.java
@@ -0,0 +1,147 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class library {
+  private String libraryName;
+  private int capacity;
+  private String operatingHours;
+  private List<book> books;
+  private List<normalUser> users;
+  private List<rent> rentals;
+  public library(String libraryName, int capacity, String operatingHours) {
+      this.libraryName = libraryName;
+      this.capacity = capacity;
+      this.operatingHours = operatingHours;
+      this.books = new ArrayList<>();
+      this.users = new ArrayList<>();
+      this.rentals = new ArrayList<>();
+  }
+  public String getLibraryName() {
+    return libraryName;
+  }
+  public int getCapacity() {
+    return capacity;
+  }
+  public String getOperatingHours() {
+    return operatingHours;
+  }
+  public void addBook(book book) {
+    if (books.size() < capacity) {
+        books.add(book);
+        System.out.println("Book added successfully!");
+        System.out.println(book.getBookId());
+    } else {
+        System.out.println("Library at full capacity. Book cannot be added.");
+    }
+}
+public book removeBook(int bookId) {
+  book removedBook = null;
+  for (int i = 0; i < books.size(); i++) {
+      if (books.get(i).getBookId() == bookId) {
+          removedBook = books.remove(i);
+          break;
+      }
+  }
+  if (removedBook != null) {
+      System.out.println("Book removed successfully!");
+  } else {
+      System.out.println("Book with ID " + bookId + " not found.");
+  }
+  return removedBook;
+}
+public void addUser(normalUser user) {
+  users.add(user);
+  System.out.println("Member added successfully!");
+}
+public normalUser removeUser(int memberId) {
+  normalUser removedUser = null;
+  for (int i = 0; i < users.size(); i++) {
+      if (users.get(i).getId() == memberId) {
+          removedUser = users.remove(i);
+          break;
+      }
+  }
+  if (removedUser != null) {
+      System.out.println("Member removed successfully!");
+  } else {
+      System.out.println("Member with ID " + memberId + " not found.");
+  }
+  return removedUser;
+}
+public void rentBook(normalUser user, book book) {
+  if (book.isAvailabilityStatus()) {
+      rent rent = new rent(book, user);
+      rentals.add(rent);
+      book.setAvailabilityStatus(false);
+      System.out.println("Book rented successfully for " + user.getName() + "!");
+  } else {
+      System.out.println("Book is not available for rent.");
+  }
+}
+public void returnBook(book book) {
+  boolean bookReturned = false;
+  for (rent rent : rentals) {
+      if (rent.getBook().equals(book)) {
+          rentals.remove(rent);
+          book.setAvailabilityStatus(true);
+          bookReturned = true;
+          System.out.println("Book returned successfully!");
+          break;
+      }
+  }
+  if (!bookReturned) {
+      System.out.println("Book not found or not currently rented.");
+  }
+}
+
+public book getBook(String bookTitle) {
+  for (book book : books) {
+      if (book.getTitle().equalsIgnoreCase(bookTitle)) {
+          return book;
+      }
+  }
+  return null;
+}
+public List<book> getAvailableBooks() {
+  List<book> availableBooks = new ArrayList<>();
+  for (book book : books) {
+      if (book.isAvailabilityStatus()) {
+          availableBooks.add(book);
+      }
+  }
+  return availableBooks;
+}
+public book getAvailableBook(String bookTitle) {
+  for (book book : books) {
+      if (book.getTitle().equalsIgnoreCase(bookTitle) && book.isAvailabilityStatus()) {
+          return book;
+      }
+  }
+  return null;
+}
+public book getBorrowedBook(normalUser user, String bookTitle) {
+  for (rent rent : rentals) {
+      if (rent.getBook().getTitle().equalsIgnoreCase(bookTitle) && rent.getUser().equals(user)) {
+          return rent.getBook();
+      }
+  }
+  return null;
+}
+public admin getAdmin(String name, int id, String phoneNumber, int password) {
+  admin admin1 = new admin("Navid", 123456789, "9204201533", 12345);
+  
+      if (admin1 instanceof admin && admin1.getName().equals(name) && admin1.getId() == id && ((admin) admin1).getPassword() == password) {
+          return (admin) admin1;
+      }
+  return null;
+}
+public normalUser getNormalUser(String name, String phoneNumber, int id) {
+  for (user user : users) {
+      if (user instanceof normalUser && user.getName().equals(name) && user.getId() == id) {
+          return (normalUser) user;
+      }
+      
+  }
+  return null;
+}
+}
\ No newline at end of file
diff --git a/Answers/40230212013/library_management_system/src/normalUser.class b/Answers/40230212013/library_management_system/src/normalUser.class
new file mode 100644
index 0000000..e26be67
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diff --git a/Answers/40230212013/library_management_system/src/normalUser.java b/Answers/40230212013/library_management_system/src/normalUser.java
new file mode 100644
index 0000000..69f2bb7
--- /dev/null
+++ b/Answers/40230212013/library_management_system/src/normalUser.java
@@ -0,0 +1,18 @@
+public class normalUser extends user {
+  private String signUpDate;
+
+  public normalUser(String name, int id, String phoneNumber, String signUpDate)
+  {
+    super(name,id, phoneNumber);
+    this.signUpDate = signUpDate;
+  }
+
+  public String getSignUpDate() {
+    return signUpDate;
+  }
+
+  public void setSignUpDate(String signUpDate) {
+    this.signUpDate = signUpDate;
+  }
+  
+}
diff --git a/Answers/40230212013/library_management_system/src/rent.class b/Answers/40230212013/library_management_system/src/rent.class
new file mode 100644
index 0000000..56cfba6
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diff --git a/Answers/40230212013/library_management_system/src/rent.java b/Answers/40230212013/library_management_system/src/rent.java
new file mode 100644
index 0000000..673cf44
--- /dev/null
+++ b/Answers/40230212013/library_management_system/src/rent.java
@@ -0,0 +1,38 @@
+public class rent {
+  private book book;
+  private user user;
+  private int rentalId;
+  private String rentalDate;
+  public rent(book book, user user)
+  {
+    this.book = book;
+    this.user = user;
+    this.rentalId = rentalId;
+    this.rentalDate = rentalDate;
+  }
+  public book getBook() {
+    return book;
+  }
+  public void setBook(book book) {
+    this.book = book;
+  }
+  public user getUser() {
+    return user;
+  }
+  public void setUser(user user) {
+    this.user = user;
+  }
+  public int getRentId() {
+    return rentalId;
+  }
+  public void setRentId(int rentId) {
+    this.rentalId = rentalId;
+  }
+  public String getRentDate() {
+    return rentalDate;
+  }
+  public void setRentDate(String rentDate) {
+    this.rentalDate = rentalDate;
+  }
+  
+}
diff --git a/Answers/40230212013/library_management_system/src/user.class b/Answers/40230212013/library_management_system/src/user.class
new file mode 100644
index 0000000..9ab6076
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diff --git a/Answers/40230212013/library_management_system/src/user.java b/Answers/40230212013/library_management_system/src/user.java
new file mode 100644
index 0000000..53ad38b
--- /dev/null
+++ b/Answers/40230212013/library_management_system/src/user.java
@@ -0,0 +1,29 @@
+public class user {
+  private String name;
+  private int id;
+  private String phoneNumber;
+  public user(String name,int id, String phoneNumber)
+  {
+    this.name = name;
+    this.id = id;
+    this.phoneNumber = phoneNumber;
+  }
+  public String getName() {
+    return name;
+  }
+  public void setName(String name) {
+    this.name = name;
+  }
+  public int getId() {
+    return id;
+  }
+  public void setId(int id) {
+    this.id = id;
+  }
+  public String getPhoneNumber() {
+    return phoneNumber;
+  }
+  public void setPhoneNumber(String phoneNumber) {
+    this.phoneNumber = phoneNumber;
+  }
+}