(a) This chapter or any part thereof may be modified, amended or repealed so as to effect a cancellation or alteration of any license or right of a licensee hereunder; provided, that such cancellation or alteration shall not impair or affect the obligations of any preexisting lawful contract between any licensee and any obligor.
(b) Nothing contained herein shall be so construed as to impair or affect the obligation of any contract of loan between any lender and any borrower which was entered into prior to August 7 1966.