fix: fix multiapp tasks (#229)

Co-authored-by: adlsdztony <zzl0712@connect.hku.hk>

evaluation_examples/examples/multi_apps/26660ad1-6ebb-4f59-8cba-a8432dfe8d38.json

@@ -1,7 +1,7 @@
 {
   "id": "26660ad1-6ebb-4f59-8cba-a8432dfe8d38",
   "snapshot": "multiapps",
-  "instruction": "I want to test the quality of the network environment my laptop is currently in. Please measure my network situation through speedtest.net, export the measurement results, and save them to ~/Test/Speed (if the dir does not exist, create it).",
+  "instruction": "I want to test the quality of the network environment my laptop is currently in. Please measure my network situation through speedtest.net, copy the results in speedtest.net/results, and save them to ~/Test/Speed/results.txt (if the dir does not exist, create it). Each metric occupies one line, with the metric name and its value separated by a single space.",
   "source": "https://www.speedtest.net/",
   "config": [
     {
@@ -54,16 +54,21 @@
     "browser"
   ],
   "evaluator": {
-    "func": "compare_time_in_speedtest_results",
+    "func": "file_contains",
     "result": {
       "type": "vm_file",
-      "path": "/home/user/Test/Speed/Speedtest Results Export-.csv",
-      "dest": "Speedtest Results Export-.csv",
-      "time_suffix": true
+      "path": "/home/user/Test/Speed/results.txt",
+      "dest": "results.txt"
     },
     "expected": {
-      "type": "time_diff_range",
-      "diff_range_in_minutes": "60"
+      "type": "rule",
+      "rules": {
+          "expected": [
+            "Ping",
+            "Download",
+            "Upload"
+          ]
+        }
     }
   },
   "proxy": true