Please write more than 1000 words based on the legal rules and case law. with detail analysis.Thanks you so much.

Case 7 - Discharge of Contract On 1 October, Shop Improvement Co. was appointed by Swan Cafe to do their cafe renovation. The tenns of contract stated that Swan Cafe would pay HK$1.8 million and the whole project must be completed on or before 20 December. Renovation started on 10 October and by 1 December two third of the project had been completed. On 2 December Swan Cafe was informed by Shop Improvement Co. that one of the Special machine needed for the renovation work had broken down, they already checked with the machine supplier but no spare part was available and it would take at least 2 months to get the Spare part from the UK manufacturer. Shop Improvement Co. said that they would not be able to nish the renovation by 20 December as agreed. They also asked Swan Cafe to pay two third of the agreed contract price because the shortage of Spare parts was beyond their control and it was not their fault. Advise Swan Caf on their legal position