diff --git a/part1_iot_framework/lab3-2-2_working_with_c/main/main.c b/part1_iot_framework/lab3-2-2_working_with_c/main/main.c
index 9fdea9e..1ec321f 100644
--- a/part1_iot_framework/lab3-2-2_working_with_c/main/main.c
+++ b/part1_iot_framework/lab3-2-2_working_with_c/main/main.c
@@ -45,6 +45,8 @@ typedef struct SensorSetStruct
 { 
   Sensor temperature;
   Sensor pressure;
+  void (* Update)(struct  SensorSetStruct *sensorSet);
+  void (* Display)(struct  SensorSetStruct *sensorSet);
 } SensorSet;
 
 /**
@@ -53,7 +55,6 @@ typedef struct SensorSetStruct
  * @param sensorSet
  */
 void defaultUpdateSensorValues(struct SensorSetStruct *sensorSet) {
-
   int random = abs(esp_random());
   sensorSet->temperature.value.f = (random % 400) / 10;
   random = abs(esp_random());
@@ -75,10 +76,9 @@ void defaultPrintSensorValues(struct SensorSetStruct *sensorSet) {
  * 
  * @param sensorSet 
  */
-void updateAndDisplaySensorValues(struct SensorSetStruct *sensorSet, void function()) {
-
-  function(sensorSet);
-  function(sensorSet);
+void updateAndDisplaySensorValues(struct  SensorSetStruct *sensorSet) {
+  sensorSet->Update(sensorSet);
+  sensorSet->Display(sensorSet);
 }
 
 
@@ -89,11 +89,13 @@ void updateAndDisplaySensorValues(struct SensorSetStruct *sensorSet, void functi
 
 void app_main(void) {
 
+
+
   /* TODO:
      Declare and init sensorSet variable (structure is SensorSetStruct)
 	 Tip: Use designated initializer
   */
- struct SensorSetStruct houlou = {
+ static struct SensorSetStruct houlou = {
   .temperature=
   {
     .name="TEMP", 
@@ -105,18 +107,20 @@ void app_main(void) {
     .name="PRES", 
     .type=INT, 
     .value={.i=0}
-  }
+  },
+  .Update= defaultUpdateSensorValues,
+  .Display= defaultPrintSensorValues
  };
 
-
   while (1) {
     // Wait for 1 sec.
     usleep(1000000);
-    updateAndDisplaySensorValues(&houlou,defaultPrintSensorValues);
-    printf ("\n%d\n", sizeof (int));
+    updateAndDisplaySensorValues(&houlou);
+    
+    /*printf ("\n%d\n", sizeof (int));
     printf ("\n%d\n", sizeof (float));
     printf ("\n%d\n", sizeof (double));
-    printf ("\n%d\n", sizeof (union SensorValueUnion));
+    printf ("\n%d\n", sizeof (union SensorValueUnion));*/
   }
 }