make filewatcher more robust

test/manual/minimal.cpp

@@ -19,7 +19,7 @@ int main(int argc, char *argv[]) {
     printf("minimal_lib::getNewValue address: %p\n", minimal_lib::getNewValue);
     printf("minimal_lib::otherValue address: %p\n", &minimal_lib::otherValue);
     printf("==========================\n");
-    printf("\n");
+    printf("");
 
     modified = minimal_lib::getNewValue(5);
     printf("getModified(5): %d\n", modified);