-uint8_t keymap_get_keycode(int row, int col);
-uint8_t keymap_get_keycodel(int layer, int row, int col);
-int keymap_get_layer(void);
-int keymap_set_layer(int layer);
+/* keycode in specific layer */
+uint8_t keymap_get_keycode(uint8_t layer, uint8_t row, uint8_t col);