refactoring: test cubeRoot funktion rename with the value

src/test/test_funktionen.c

@@ -27,7 +27,7 @@ void test_cube_for_2(void) {
     TEST_ASSERT_EQUAL_FLOAT(8.0, result);
 }
 
-void test_cubeRoot(void) {
+void test_cubeRoot_for_27(void) {
     float result = cubeRoot(27.0);
     TEST_ASSERT_EQUAL_FLOAT(3.0, result);
 }