Add List_reverse()

src/list.c

@@ -184,6 +184,26 @@ int List_sort(List *list, bool reverse) {
     return List_mergeSort(list, 0, list->_currentSize, reverse);
 }
 
+int List_reverse(List *list) {
+    for (int i = 0, j = list->_currentSize; i < j; i++, j--) {
+        int element = List_get(list, j);
+        if (element == ERRNO_003) {
+            return element;
+        }
+
+        int previousElement = List_insert(list, i, element);
+        if (previousElement == ERRNO_003) {
+            return element;
+        }
+
+        if (List_insert(list, j, previousElement) == ERRNO_003) {
+            return ERRNO_003;
+        }
+    }
+
+    return 0;
+}
+
 List *List_copy(List *list) {
     List *listCopy = List_createList(list->_maxSize, list->_currentSize);
     if (!listCopy) {

src/list.h

@@ -120,6 +120,25 @@ int List_remove(List *list, int element);
  */
 int List_sort(List *list, bool reverse);
 
+/*
+ *
+ * Description
+ * ----------------------------
+ *  Reverse the elements in the list
+ *  =======================================
+ *  WARNING: This is an in-place operation
+ *  =======================================
+ *
+ * Params
+ * ----------------------------
+ *  *list       the list to reverse elements in
+ *
+ * Returns
+ * ----------------------------
+ *  int (0 for success, Non-0 for error)
+ */
+int List_reverse(List *list);
+
 /*
  *
  * Description

src/test/test.c

@@ -159,6 +159,26 @@ void shouldRemoveElementFromList() {
     printSuccess(__func__);
 }
 
+void shouldReverseList() {
+    // Arrange
+    List *list = List_new();
+    List_append_all(list, 5, 50, 100, 75, 200, 300);
+
+    // Act
+    int returnCode = List_reverse(list);
+
+    // Assert
+    assert(returnCode == 0);
+    assert(List_get(list, 0) == 300);
+    assert(List_get(list, 1) == 200);
+    assert(List_get(list, 2) == 75);
+    assert(List_get(list, 3) == 100);
+    assert(List_get(list, 4) == 50);
+    List_destroy(&list);
+
+    printSuccess(__func__);
+}
+
 int main() {
     printf("============================================");
     printf("\nSTART TESTING");
@@ -172,6 +192,7 @@ int main() {
     shouldCopyEmptyList();
     shouldInsertElementIntoListIndexZero();
     shouldRemoveElementFromList();
+    shouldReverseList();
     printf("\n\n============================================");
     printf("\nFINISH TESTING");
     printf("\n============================================");