all library methods working correctly
fixed borrower class and rspec file
library initializes
adds new book and assigns id, defaults to nil
can add multiple books, may need to revisit id system
updated register_new_book method in library class to push a new book object into @books with Book.new
book cannot be checked out twice in a row test now passes. finished check_out_method up to step11
added check_in_book method and tested
added available books method, borrower checkout more than one method still not working. returns nomethoderror for on book.title saying nil:NilClass
returns how many books are currently out
added knoews who borrowed book method, still ned to fix does not allow borrower to check out more thna one book and after book is returned, can be checked out again
added can check out no more than two books method
all methods working