No officer or employee of the City shall have a financial interest, direct or indirect, in any contract with the City, or shall be financially interested, directly or indirectly, in the sale to the City of any land, materials, supplies or service. Any willful violation of this section shall constitute malfeasance in office, and any officer or employee violating this section shall forfeit his/her office or position. Any violation of this section, with the knowledge expressed or implied of a person or corporation contracting with the City, shall render the contract involved voidable by the Council.