Walgreens CEO Tim Wentworth told CNBC's Jim Cramer that the company is using its stores and brand to bolster its developing health-care business.Walgreens has made significant investments over the past few years to expand beyond a drugstore chain into a large health-care company. Wentworth acknowledged that the company has been closing stores to make sure it has the "right optimized footprint," but challenged the notion that Walgreens has to fully pivot from its stores to pursue its health-care goals."If yo ...