refactor mapper1
refactor mapper1

fogleman/nes,wangweijia/nes,UIKit0/nes,horryq/nes,liqingzhu/nes,xuxiandi/nes,sheenobu/nes,tastynoodle/nes,Esmidth/nes,Endika/nes,shaggytwodope/nes,Rosmianto/nes,sunclx/nes,trigrass2/nes,EmuxEvans/nes,insionng/nes