refactored method for adding items
refactored method for adding items

codylieu/oogasalad_OOGALoompas,sdh31/tower_defense,garysheng/tower-defense-game-engine,dianwen/oogasalad_TowerDefense,dennis-park/OOGALoompas,jordanly/oogasalad_OOGALoompas,kevinkdo/oogasalad_OOGALoompas