fix: fix multiapp tasks (#229)

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

evaluation_examples/examples/multi_apps/3680a5ee-6870-426a-a997-eba929a0d25c.json

@@ -1,7 +1,7 @@
 {
   "id": "3680a5ee-6870-426a-a997-eba929a0d25c",
   "snapshot": "libreoffice_calc",
-  "instruction": "I have file1.xlsx and file2.ods on the Desktop and each has one column. Help me use only the command line to merge these two columns into one LibreOffice Calc file called output.csv and open it from terminal.",
+  "instruction": "I have file1.xlsx and file2.ods on my Desktop, each containing a single column. Using only the command line, help me merge these two columns into a single column by concatenating the strings from both rows, save the result as ~/Desktop/output.csv, and open it in LibreOffice Calc from the terminal",
   "source": "https://unix.stackexchange.com/questions/510850/how-to-open-calc-from-terminal-and-insert-files",
   "config": [
     {