strcmp instead of == in cache_get and cache_del

LRU.c

@@ -123,7 +123,7 @@ char* cache_get(char *key)
 {
     for(int i=0;i<MAX_SIZE;i++)
     {
-        if(array[i]->key == key)
+        if(strcmp(array[i]->key , key) == 0)
         {
             while(ATOMIC_TEST_AND_SET(&(array[i]->lock),1) == 1);
             remove_element_from_deque(key);