PARIS(Reuters) -French retailer Casino's full-year losses deepened sharply as it felt the impact of restructuring and stiff competition for its large hypermarkets, the company said on Wednesday, sending its shares plunging by as much as 15%. Casino suffered a consolidated net loss of 5.7 billion euros ($6.2 billion) last year, widening from 316 million euros the previous year, and said it will not publish a revised 2024 outlook in view of its imminent change in leadership. The new leadership team will be formed around Czech billionaire Daniel Kretinsky after the company was brought to the brink of default by years of debt-fuelled acquisitions and loss of market share to rivals.