fix: remove memory leak in sublist_search.cpp (TheAlgorithms#2541)

Co-authored-by: realstealthninja <[email protected]>

Author: vil02

search/sublist_search.cpp

@@ -90,6 +90,20 @@ Node *makeLinkedList(const std::vector<uint64_t> &data) {
     return head;
 }
 
+/*
+ * @brief This function dealocates memory related to the given list
+ * It recursively deletes all of the nodes of the input list.
+ * @param room the root/head of the input list
+ * @warning Plese note that the memory for each node has to be alocated using
+ * new.
+ */
+void deleteList(Node *const root) {
+    if (root != NULL) {
+        deleteList(root->next);
+        delete root;
+    }
+}
+
 /**
  * @brief Main searching function
  * @param sublist A linked list which is supposed to be searched in mainList.
@@ -217,8 +231,8 @@ class TestCases {
         log("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
             "~");
 
-        delete (sublistLL);
-        delete (mainlistLL);
+        deleteList(mainlistLL);
+        deleteList(sublistLL);
     }
 
     /**
@@ -270,6 +284,9 @@ class TestCases {
         log("[PASS] : TEST CASE 2 PASS!");
         log("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
             "~");
+
+        deleteList(mainlistLL);
+        deleteList(sublistLL);
     }
 
     /**
@@ -318,6 +335,9 @@ class TestCases {
         log("[PASS] : TEST CASE 3 PASS!");
         log("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
             "~");
+
+        deleteList(mainlistLL);
+        deleteList(sublistLL);
     }
 };
 
@@ -366,5 +386,8 @@ int main(int argc, char *argv[]) {
     } else {
         std::cout << "[FALSE] - sublist NOT found in main list\n";
     }
+
+    deleteList(mainlistLL);
+    deleteList(sublistLL);
     return 0;
 }