Section 18
SEC. 18. The officers shall not engage in certain transactions nor receive favors or benefits.-It shall be unlawful for any officer of the city directly or indirectly, individually or as a member of a firm, to engage in any business transaction with the city or with any of its authorized officers, boards, agents or attorneys, whereby money is to be paid, directly or indirectly out of the resources of the city to such person or firm; or to purchase any real estate or other property belonging to the city, or which shall be sold for taxes or assessment or by virtue of legal process at the suit of the city, or to be surety for any person having a contract with the city.