refactoring: naturalLogarithm function test change

src/test/test_funktionen.c

@@ -37,12 +37,12 @@ void test_absolute_for_5(void) {
     TEST_ASSERT_EQUAL_FLOAT(5.0, result);
 }
 
-void test_logarithm(void) {
+void test_logarithm_for_100(void) {
     float result = logarithm(100.0);
     TEST_ASSERT_FLOAT_WITHIN(0.000001, 2.0, result);
 }
 
-void test_naturalLogarithm(void) {
+void test_naturalLogarithm_for_100(void) {
     float result = naturalLogarithm(100.0);
     TEST_ASSERT_FLOAT_WITHIN(0.000001, 4.60517, result);
 }