No officer of the City shall have any financial interest, directly or indirectly, (other than the common public interest) in the profits of any contract job, work, or service to be performed for the City; nor shall he stand as surety or give any bail or sign any bail or appearance bond required by the ordinances of the City. The foreging prohibitions, as the same may apply to any Councilman, shall not apply if the Council shall declare in its records, by the unanimous vote of the remaining members of the Council that the best interests of the City are to be served by the waiving of any such prohibition. No officer of the City shall personally, or as an agent, provide any bond which is subject to approval by the Council. Any officer of the City who violates the provisions of this section shall be guilty of misconduct in office.