Chad J. Husnick wanted to be a doctor when he was a little kid. But having built a legal practice centered around corporate restructuring, Husnick views his job as helping “sick companies.”The 39-year-old Kirkland & Ellis LLP partner can often be found working with his clients who are undergoing some of the largest bankruptcy proceedings in the United States, where the amount of money at stake easily reaches into the billions of dollars.His clients have included Energy Future Holdings, a Dallas-based energy …