A.   No member of the city council may sell or furnish for a consideration, any materials or other supplies for use of the city; and any member of the council voting for or consenting to or being a party to such contract or purchase is personally liable as provided by state law.
   B.   The city council shall not make any contract with any of its members or in which any of its members shall be directly or indirectly interested, such contracts being prohibited by state law.
   C.   No officer of the city may become directly or indirectly interested individually in any sale, lease or contract which he is authorized to make, such being prohibited by state law. (Prior code § 7-7)