No officer or employee of the City shall have a financial interest, direct or indirect, in any contract with the City, nor shall be financially interested directly, or indirectly, in the sale to the City of any land, or rights or interest in any land, materials, supplies or service. The above provision shall not apply where the interest is represented by ownership of stock in a corporation involved, provided such stock ownership amounts to less than one per cent (1%) of the corporation stock. Any violation of this section shall constitute malfeasance in office, and any officer or employee of the City found guilty thereof shall thereby forfeit his office or position. Any violation of this section with the knowledge, express or implied, of the person or corporation contracting with the City shall render the contract voidable by the City Manager or the City Council.