add radix

src/radix_sort_par3.cu

@@ -55,7 +55,7 @@ void countSort(int arr[], int n, int exp)
         arr[i] = output[i]; 
 
     cudaFree(d_arr);
-    //cudaFree(d_count);
+    cudaFree(d_count);
 } 
   
 // The main function to that sorts arr[] of size n using