some refactoring

example/test/FsfwTestTask.cpp

@@ -1,9 +1,16 @@
 #include "FsfwTestTask.h"
-#include "../test/testFmt.h"
+
+#include <commonConfig.h>
+
+#if FSFW_ADD_FMT_TESTS == 1
+#include "testFmt.h"
+#endif
 
 FsfwTestTask::FsfwTestTask(object_id_t objectId, bool periodicEvent)
     : TestTask(objectId), periodicEvent(periodicEvent) {
+#if FSFW_ADD_FMT_TESTS == 1
   fmtTests();
+#endif
 }
 
 ReturnValue_t FsfwTestTask::performPeriodicAction() {