characterAppearanceInString() definiert und einen Test für die Funktion geschrieben

src/c/funktionen.c

@@ -63,4 +63,16 @@ int string_character_counter(char string[]) {
     }
 
     return stringLength;
+}
+
+int characterAppearanceInString(char c, char string[]) {
+    int appear = 0;
+
+    for (int i = 0; i < string_character_counter(string); i++) {
+        if (string[i] == c) {
+            appear++;
+        }
+    }
+
+    return appear;
 }

src/test/test_funktionen.c

@@ -121,4 +121,20 @@ void test_stringLaenge_von_Kokosnuss(void)
     TEST_ASSERT_EQUAL_INT(expected, actual);
 }
 
+void test_howManyTimes_e_appearsIn_Beere(void)
+{
+    /* arrange */
+    int actual;
+    int expected = 3;
+
+    char c = 'e';
+    char string[] = "Beere";
+
+    /* act */
+    actual = characterAppearanceInString(c, string);
+
+    /* assert */
+    TEST_ASSERT_EQUAL_INT(expected, actual);
+}
+
 #endif