qmk_firmware/keyboards/yatara/drink_me/keymaps/via/keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    [0] = LAYOUT(
        KC_0,
        KC_1,
        KC_2,
        KC_3
    ),
    [1] = LAYOUT(
        KC_TRNS,
        KC_TRNS,
        KC_TRNS,
        KC_TRNS
    ),
    [2] = LAYOUT(
        KC_TRNS,
        KC_TRNS,
        KC_TRNS,
        KC_TRNS
    ),
    [3] = LAYOUT(
        KC_TRNS,
        KC_TRNS,
        KC_TRNS,
        KC_TRNS
    )
};