Final answer:
Sharon is in violation of the leasing agreement by not providing a forwarding address within the specified time period. The landlord may hold her responsible for additional rent and damages, and has the right to take legal action.
Step-by-step explanation:
According to the stipulations in the leasing agreement, Sharon is required to provide her landlord with a forwarding address within four days of vacating the apartment. By ignoring this notice and failing to comply with the requirement, Sharon is in violation of the terms of the agreement.
As a result, the landlord may hold Sharon responsible for additional rent and damages, including damages resulting from the owner's loss of prospective new renters. Furthermore, the landlord has the right to take legal action against Sharon for her failure to vacate the premises and return any property provided by the landlord.