implemented , on sharing of keys cache keys from old server deleted

LFU.h

@@ -330,6 +330,10 @@ public:
         cout << endl;
     }
 
+    int hash(string s)
+    {
+        return (((int)s.at(0)) << 8) + ((int)s.at(1));
+    }
     string getKeyValuePairs(int id)
     {
         unordered_map<string, string> flush;
@@ -379,14 +383,20 @@ public:
             closedir(dirFile);
         }
 
-        Node *temp = head->next;
-        while (temp->next)
+        vector<string> toBeDeleted;
+
+        for (int i = 0; i <= curr_pos; i++)
         {
-            if (hash(temp->key) <= id)
+            if (hash(cacheHeap[i]->key) <= id)
             {
-                flush[temp->key] = temp->payload;
+                toBeDeleted.push_back(cacheHeap[i]->key);
+                flush[cacheHeap[i]->key] = cacheHeap[i]->value;
             }
-            temp = temp->next;
+        }
+
+        for (string key : toBeDeleted)
+        {
+            this->deleteNodeByKey(key);
         }
 
         unordered_map<string, string>::iterator itr;