(a) All owners, occupants and persons in charge of real estate in the City shall remove snow, ice and sleet from sidewalks on which their property borders.
(b) The snow, ice and sleet shall be removed within five hours after snow or sleet stops falling, except should the five hour limit require the removal after sundown, in which event the snow, ice and sleet shall be removed immediately after 9:00 a.m. the following day.
(c) In removing snow, sleet and ice from sidewalks as herein required, it shall be unlawful for any person to case such snow, sleet or ice into or upon any street, gutter or public way.