freeVertex(prev_vtx); freeVertex(prev_vtx); p1.next = null; p1.prev = null; freeVertex(p1); freeVertex(p); freeVertex(current); current = null;
freeVertex(prev_vtx); freeVertex(prev_vtx); p1.next = null; p1.prev = null; freeVertex(p1); freeVertex(p); freeVertex(current); current = null;