Be it further enacted, that the City of Crossville is further authorized to issue refunding bonds for the purpose of refunding any outstanding bonds authorized under the terms of this law, and the provisions relative to the issuance of bonds hereunder shall be applicable to the issuance of such refunding bonds, provided that such refunding bonds may, in lieu of sale thereof, be delivered in exchange for the original bonds being refunded. If deemed advisable, such refunding bonds may be issued in combination with bonds authorized hereunder for improvements or extensions. (As amended by Priv. Acts 2014, ch. 55, sec. 1)