By Susan Snyder From The Philadelphia Inquirer Temple University’s public safety executive and police chief, who has been at the school for more than 36 years, has resigned amid a surge of violence in the campus’ North Philadelphia neighborhood. Charles Leone will step down effective April 29, according to a source close to the university. It wasn’t immediately clear why Leone is leaving now. Deputy director Denise Wilhelm, also a member of the department for more than 30 years, is stepping in as interim chief. The university plans to launch a national search and hire a consultant to help, the school said. The move comes a day after the university announced new measures to try and improve safety, including offering nearby landlords with student tenants up to $2,500 grants to install lighting and cameras on their properties. It also is opening up on-campus residences to any off-campus students who want …