qmk_firmware/keyboards/butterstick/butterstick.h

#pragma once

#include "quantum.h"

#define LAYOUT_butter( 										\
    k09, k08, k07, k06, k05, k04, k03, k02, k01, k00,		\
	k19, k18, k17, k16, k15, k14, k13, k12, k11, k10		\
) { 														\
	{ k00, k01, k02, k03, k04, k05, k06, k07, k08, k09},	\
	{ k10, k11, k12, k13, k14, k15, k16, k17, k18, k19},	\
}