cleanup
cleanup

* Remove redundant method call
* Avoid mutable collection

ponkotuy/MyFleetGirls,b-wind/MyFleetGirls,Moesugi/MFG,kxbmap/MyFleetGirls,ttdoda/MyFleetGirls,kxbmap/MyFleetGirls,nekoworkshop/MyFleetGirls,kxbmap/MyFleetGirls,ttdoda/MyFleetGirls,Moesugi/MFG,kxbmap/MyFleetGirls,nekoworkshop/MyFleetGirls,ttdoda/MyFleetGirls,nekoworkshop/MyFleetGirls,ponkotuy/MyFleetGirls,Moesugi/MFG,ponkotuy/MyFleetGirls,b-wind/MyFleetGirls,Moesugi/MFG,nekoworkshop/MyFleetGirls,ttdoda/MyFleetGirls,b-wind/MyFleetGirls,ponkotuy/MyFleetGirls,b-wind/MyFleetGirls