No officer, employee or agent of the city shall engage in a conflict of interest or use his or her position with the city for private gain. For example, no officer, employee or agent shall (1) have a personal interest in any contract with or for the city, except as allowed by state law; (2) act in an official capacity on matters in which that person has a private interest distinct from that of the public; or (3) disseminate or use confidential information regarding city matters.