Every bill which shall have passed both houses of the General Assembly and shall not be returned by the Governor within five (5) days, having thereby become a law, shall be authenticated by the Governor causing the fact to be certified thereon by the Secretary of State in the following form: “This bill having remained with the Governor five (5) days, Sunday excepted, and the General Assembly being in session, it has become a law this . . . . . . . . . . day of . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Secretary of State”.