added logic to ConTime and Unittest for the function

src/main/c/ConvertMode.c

@@ -188,6 +188,18 @@ double getValue(int choice) {
 
             printf("\nThe convertet result is %dlf %d³", result, Distance[endingUnit]);
             break;
+
+        case 13:
+            printf("\nEnter what the Unit is starting with (0 (24h), 1 (12h)): ");
+            scanf("%d", &startingUnit);
+
+            printf("\nEnter what the value should it be changed to (0 (24h), 1 (12h)): ");
+            scanf("%d", &endingUnit);
+
+            result = ConArea(value, startingUnit, endingUnit);
+
+            printf("\nThe convertet result is %dlf %d", result, Distance[endingUnit]);
+            break;
         }
     }
 }
@@ -233,11 +245,6 @@ double ConSpeed(double speed, int startingUnit, int endingUnit) {
 
 
 
-
-double ConTime() {
-
-}
-
 double ConClock() {
 
 }
@@ -254,7 +261,7 @@ void unitConverterMode() {
 
     printf("Weight conversion:\n");
     printf("4. Convert Gram  (mg, g, kg)\n");
-    printf("5. Gram to Pounds \n")
+    printf("5. Gram to Pounds \n");
 
     printf("Temprature conversion:\n");
     printf("6. Celsius to Fahrenheit\n");
@@ -274,7 +281,7 @@ void unitConverterMode() {
     printf("12. Convert Volume (cm³, m³, km³)\n");
 
     printf("Time conversion \n");
-    printf("13. Convert time (s, m, h) \n");
+    printf("13. Convert time (s, m, h, d, w, m, y) \n");
     printf("14. Convert Clock (12 Hour, 24 Hour) \n");
 
     printf("Time conversion \n");

src/main/c/main_taschenrechner.c

@@ -948,6 +948,49 @@ double ConVolume(double volum, int startingUnit, int endingUnit) {
         break;
     }
 }
+double ConTime(double time, int startingUnit, int endingUnit) {
+    switch (startingUnit)
+    {
+    case 0: //24 to x
+        switch (endingUnit)
+        {
+        case 0: //24 to 24
+            return time;
+            break;
+
+        case 1: //24 to 12
+            if (time > 12) {
+                return time -12;
+            }
+
+            else {
+                return time
+            }
+            break;
+
+        default:
+            break;
+        }
+
+    case 1: //12 to x
+        switch (endingUnit)
+        {
+        case 0: //12 to 24
+            return time + 12;
+            break;
+
+        case 1: //12 to 12
+            return time;
+            break;
+
+        default:
+            break;
+        }
+
+    default:
+        break;
+    }
+}
 
 
 //..

src/main/c/taschenrechner.h

@@ -81,4 +81,6 @@ double ConArea(double area, int startingUnit, int endingUnit);
 
 double ConVolume(double volum, int startingUnit, int endingUnit);
 
+double ConTime(double time, int startingUnit, int endingUnit);
+
 #endif // TASCHENRECHNER_H

src/test/c/test_taschenrechner.c

@@ -98,6 +98,10 @@ void test_ConVolume(void) {//5 mm to cm
     TEST_ASSERT_EQUAL(0.005), result);
 }
 
+void test_ConTime(void) {//5:00 to 5AM
+    double result = ConData(5, 0, 1);
+    TEST_ASSERT_EQUAL(5), result);
+}