Reuters: Shares of U.S. ethanol makers took a beating on Wednesday as they wrestle with unpredictable corn prices and dwindling cash piles at a time when capital markets look unlikely to provide easy financing. Aventine Renewable Energy Holdings Inc said on Wednesday it could seek to issue new debt and shares or delay construction of some plants to shore up its cash position, and its shares tumbled 22 percent to $3.94 in afternoon trade. That came a day after industry leader VeraSun …