refactor function and file naming

Core/Src/main.c

@@ -24,7 +24,7 @@
 
 #include "generic_macros.h"
 #include "lcd.h"
-#include "external_temp.h"
+#include "DNI.h"
 #include "PCA9685.h"
 #include "24AA02E48.h"
 
@@ -56,8 +56,8 @@ I2C_HandleTypeDef hi2c1;
 /* USER CODE BEGIN PV */
 
 void ((*executors[])(void)) = {
-		external_temp_show_celsius,
-		external_temp_show_fahrenheit,
+		DNI_show_celsius,
+		DNI_show_fahrenheit,
 		PCA9685_run_test,
 		EEPROM_24AA02E48_run_test
 };