refactoring: test squareRoot function rename

src/test/test_funktionen.c

@@ -17,7 +17,7 @@ void test_square(void) {
     TEST_ASSERT_EQUAL_FLOAT(6.25, result);
 }
 
-void test_squareRoot(void) {
+void test_squareRoot_for_9(void) {
     float result = squareRoot(9.0);
     TEST_ASSERT_EQUAL_FLOAT(3.0, result);
 }