A former college accounting professor and his wife, who together owned a pharmacy in Trenton, were charged separately by federal prosecutors on Thursday — he for tax evasion and she for illegally distributing oxycodone and other drugs. Florence Ndubizu, 62, is charged with three counts of dispensing and distributing controlled substances, while her husband, Gordian A. Ndubizu, 67, is facing four counts of tax evasion and four counts of filing false tax returns, the U.S. Attorney’s Office for New Jersey said. Authorities said Florence filed fraudulent prescriptions knowing they weren’t for a le…