refactoring: naturalLogarithmPlusOne function test, rename

src/test/test_funktionen.c

@@ -191,7 +191,7 @@ void test_logarithmPlusOne_for_10_0(void) {
     // Add more test cases for different inputs and expected outputs
 }
 
-void test_naturalLogarithmPlusOne(void) {
+void test_naturalLogarithmPlusOne_for_10_0(void) {
     float result = naturalLogarithmPlusOne(10.0);
     TEST_ASSERT_EQUAL_FLOAT(3.302585, result);
 // Add more test cases for different inputs and expected outputs