The appointive officers of the City shall be a Treasurer, an Assessor, a Police Chief, a City Attorney, a Board of Review, a City Clerk, and a City Manager. The Council may create by ordinance such additional offices as it may deem necessary for the operation of the City government, provided they do not invade the functions of the foregoing offices, or may combine any such offices in one or more persons in any manner not inconsistent with the general laws of the State.