I need help creating object files for the following classes. I am a beginner and need to understand : #ifndef AUTHOR$\_$NARRATOR$\_$H

#define AUTHOR$\_$NARRATOR$\_$H

#include

#include

#include "Book.h$"$

class AuthorNarrator $\{$

private:

std::string name;

std::vector authoredBooks;

public:

$//$ Constructor

AuthorNarrator$($const std::string& name$)$;$//$initializes an author$/$narrator with a given name

$//$ Destructor

~AuthorNarrator$()$;$//$cleans up memory for books

$//$ Getters

std::string getName$()$ const;$//$returns the name of the author$/$narrator

std::vector getAuthoredBooks$()$ const;$//$returns the lists of books by the author$/$narrato

$//$ Setters

void setName$($const std::string& name$)$;$//$sets the name of the author$/$narrator

$//$ Other methods

void addAuthoredBook$($Book$*$ book$)$;$//$adds a book by author narrator

void removeAuthoredBook$($Book$*$ book$)$;$//$removes a book by author$/$narrator

void listAuthoredBooks$()$ const;$//$lists all books by author$/$narrator

$\}$;

#endif $//$ AUTHOR$\_$NARRATOR$\_$H$.............................................$#ifndef BOOK$\_$H

#define BOOK$\_$H

#include

#include

class AuthorNarrator; $//$ Forward declaration

class Book $\{$

private:

std::string title;

std::vector authors;

int publicationYear;

std::string genre;

bool isAvailable;

public:

$//$ Constructor

Book$($const std::string& title, int publicationYear, const std::string& genre$)$;

$//$ Destructor

~Book$()$;

$//$ Getters

std::string getTitle$()$ const;

std::vector getAuthors$()$ const;

int getPublicationYear$()$ const;

std::string getGenre$()$ const;

bool getAvailability$()$ const;

$//$ Setters

void setTitle$($const std::string& title$)$;

void setAuthors$($const std::vector& authors$)$;

void setPublicationYear$($int publicationYear$)$;

void setGenre$($const std::string& genre$)$;

void setAvailability$($bool available$)$;

$//$ Other methods

void addAuthor$($AuthorNarrator$*$ author$)$;$//$Adds an author to the book's list of authors

void removeAuthor$($AuthorNarrator$*$ author$)$;$//$Removes an author the book's list of authors

void borrowBook$()$;$//$Handles the process of borrowing the book

void returnBook$()$;$//$Handles the process of returning the book

$\}$;$.......................................................................$#ifndef LIBRARY$\_$H

#define LIBRARY$\_$H

#include

#include

#include "Book.h$"$

class Library $\{$

private:

std::string name;

std::vector books;

public:

$//$ Constructor

Library$($const std::string& name$)$;$//$initializes a library with a given name

$//$ Destructor

~Library$()$;$//$cleans up memory for book

$//$ Getters

std::string getName$()$ const;$//$returns the name of the library

std::vector getBooks$()$ const;$//$returns the list of books in the libary

$//$ Setters

void setName$($const std::string& name$)$;$//$sets the name of the library

$//$ Other methods

void addBook$($Book$*$ book$)$;$//$add a book to the library's collection

void removeBook$($Book$*$ book$)$;$//$removes a book from the library's collection

void listBooks$()$ const;$//$lists all books in the library

Book$*$ findBookByTitle$($const std::string& title$)$ const;$//$finds a book by it's title in the library

$\}$;$...............................$