On CNBC’s “Mad Money Lightning Round,” Jim Cramer said NANO Nuclear Energy Inc. (NASDAQ:NNE) is losing a “lot of money.” On Oct. 1, NANO Nuclear Energy said Carlos O. Maidana has been named as the company’s head of thermal hydraulics and space program. Cramer recommended buying McKesson Corporation (NYSE:MKC). “I’m ready to start buying, don’t buy all at once.” On Sept. 25, Deutsche Bank analyst George Hill maintained McKesson with a Buy and lowered the price target from $623 to $579. Diamondback Energy, Inc. (NASDAQ:FANG) is a “little too much oil for me,” Cramer said. On Oct 1, Wells Fargo a…