CNN  —  It’s hard to think of anyone on Wall Street who contains quite the same contradictions as Warren Buffett. He’s a white-haired, ice-cream-eating, Cherry-Coke drinking avuncular figure — who has also cut some of the world’s sharpest deals and amassed a fortune bigger than some nations’ entire annual economy. Buffett, 94, said Saturday at Berkshire Hathaway’s annual shareholder meeting that he would step down as CEO at the end of the year, handing the reins to his chosen successor, Greg