diff --git a/src/main/java/com/hnucm/homework4/HistoryActivity.java b/src/main/java/com/hnucm/homework4/HistoryActivity.java
index a82be9e..a2ed93f 100644
--- a/src/main/java/com/hnucm/homework4/HistoryActivity.java
+++ b/src/main/java/com/hnucm/homework4/HistoryActivity.java
@@ -62,7 +62,7 @@ public class HistoryActivity extends AppCompatActivity {
                 runOnUiThread(new Runnable() {
                     @Override
                     public void run() {
-                        
+
                         try {
                             Gson gson = new Gson();
                             Lishi lishi = gson.fromJson(result,Lishi.class);