Add Whitespace Test with many Spaces

fix Whitespace function

src/inputHandling.c

@@ -26,6 +26,7 @@ void deleteWhitespace(char* formulaString, int length){
             for (int j=stringPos; j < length; j++){
                 formulaString[j]=formulaString[j + 1];
             }
+            stringPos--;
         }
     }
 }

test/test_inputHandling.c

@@ -5,6 +5,7 @@
 #include "inputHandling.h"
 char halloWelt[]="Hallo Welt";
 char halloWelt2[]="Hallo  Welt";
+char halloWelt3[]="Ha  llo  W el t ";
 
 void setUp(void)
 {
@@ -22,8 +23,14 @@ void test_inputHandling_deleteOneWhiteSpace(void)
 
 void test_inputHandling_deleteTwoWhiteSpaces(void)
 {
-    deleteWhitespace(halloWelt, 11);
-    TEST_ASSERT_EQUAL_STRING("HalloWelt", halloWelt);
+    deleteWhitespace(halloWelt2, 11);
+    TEST_ASSERT_EQUAL_STRING("HalloWelt", halloWelt2);
+}
+
+void test_inputHandling_deleteManyWhiteSpaces(void)
+{
+    deleteWhitespace(halloWelt3, 16);
+    TEST_ASSERT_EQUAL_STRING("HalloWelt", halloWelt3);
 }
 
 #endif // TEST