CreateBook creates a new book based on the request body and sends the created book as a JSON response.

DeleteBook removes a book based on its ID and sends the deletion status as a JSON response.

GetBookById retrieves details of a specific book by ID and sends it as a JSON response.

GetBooks retrieves a list of books and sends it as a JSON response.

UpdateBook modifies details of an existing book based on the request body and sends the updated book as a JSON response.