implement clearTree() and fix addToTree()

bintree.c

@@ -26,7 +26,7 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
             free(newNode); //Free unused Memory
             return NULL;; //Memory allocation failed
         }
-        newNode->data = data; //Copy Data
+        memcpy(newNode->data, data, dataSize); //Copy Data
 
         newNode->left = NULL;
         newNode->right = NULL;
@@ -74,7 +74,16 @@ void *nextTreeData(TreeNode *root)
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)
 {
-
+    if(root == NULL){
+        return;
+    }
+    
+    clearTree(root->right);
+    clearTree(root->left);
+    
+    free(root->data);
+    free(root);
+    
 }
 
 // Returns the number of entries in the tree given by root.