§ 93. Performance of public work to be certified. All public work performed pursuant to contract under the supervision or control of the commissioner shall, before it is accepted, be certified to by him to the effect that such work has been performed in a good and substantial manner with the materials required, of the quality and in the manner directed by the terms of the contract under which the same was done. Within ten days after the completion of any such work the commissioner shall file a certificate of such completion with the comptroller and with the city clerk, to be reported by him to the common council. Such certificate shall state in substance that said work has been duly examined by the commissioner and that the same has been fully performed and completed in accordance with the terms of the contract therefor.