An armed man shot at an armed robber who stole his wallet in Philadelphia’s Olney neighborhood late Thursday night, police said. The 25-year-old man was walking home along the 5700 block of North Front Street around 11:30 p.m. when he was approached by a masked robber, according to investigators. The robber pulled out a gun, went through the victim’s pockets and removed his wallet, police said. The 25-year-old man then pulled out his own gun – a semiautomatic weapon – and fired at the robber, ac