text: #ifndef LIBRARY_H
  #define LIBRARY_H
  
  typedef struct Book{
     char name[100];
     char author[100];
     struct Book * next;
  }BOOK, *PBOOK;
  
  PBOOK createLibrary();
  _Bool addBook(PBOOK);
  void printLibrary(PBOOK);
  void printBook(PBOOK);
  void releaseLibrary(PBOOK);
  #endif
  