No ordinance or resolution shall contain more than one subject, which shall be clearly expressed in its title. No ordinance or section thereof shall be revived or amended unless the new ordinance contains the entire ordinance or section revived or amended and unless the ordinance or section so amended is repealed. Each such resolution and ordinance shall be adopted or passed by a separate vote of the legislative authority and the yeas and nays shall be entered upon the journal.
(R.C. § 731.19)