My SQL Dynamic query execute and get ouput into a variable in stored procedure

DELIMITER $$

DROP PROCEDURE IF EXISTS `enterpriseaccessv2`.`prc_citysummary`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `prc_citysummary`(in cityname varchar (200),in username varchar(200),in city_code varchar(200),

out c_onnet varchar(1000),

out c_section varchar(1000),

out c_rings varchar(1000),

)

BEGIN

                SET @section = '';

                SET @Ring = '';

                SELECT count(*) into c_onnet  FROM ovlcustomerinformation  WHERE CityCode = city_code and customer_type = 'onnet';

               

                 SET @s= CONCAT('select count(section_name) INTO  @section  from ',city_code,'_sectiondetails');

                 PREPARE stmt FROM @s;

                 EXECUTE stmt;

                SET @s1 = CONCAT('select count(distinct BOP_RingName) INTO  @Ring from  ',city_code,'_ringdetails');

                PREPARE stmt FROM @s1;

                EXECUTE stmt;

                DEALLOCATE PREPARE stmt;

                SET c_section = @section;

                SET c_rings = @Ring;

    END$$

DELIMITER ;

Call Procedure

call prc_citysummary('Bhopal','sunil','G004',@c_onnet,@c_section,@c_rings)
select @c_onnet,@c_section,@c_rings