Fixed variable name.

templates/normal/experiment.cpp

@@ -68,7 +68,7 @@ void benchmark_out()
             auto core_id = benchmark[i][j].core_id;
             std::cout << "instance " << j << " ";
             std::cout << "start " << task_start << " ";
-            std::cout << "end " << end_task << " ";
+            std::cout << "end " << task_end << " ";
             std::cout << "core_id " << core_id << std::endl;
         }
     }