fix bug in testing with one string as param

- "\"param\"" was not working and it needed to be '""param""' to make it
  work, possibly becoz of a change of the leetcode graphql api

Author: 8ooo8

autoload/leetcode/testCode.vim

@@ -3,10 +3,13 @@ fu! leetcode#testCode#testCode(...)
   try
     let test_cmd = 'leetcode test "' .expand('%:p') .'"'
     let Q_fullname = expand('%:p:h:t')
-    if !a:1 && len(a:2)
-      let test_cmd .= ' -t "' .substitute(a:2, '"', '\\"', 'g') .'"'
-    elseif !a:1 && len(a:2) == 0 && leetcode#utils#accessFiles#lastFailCaseExists(Q_fullname)
-      let test_cmd .= ' -t "' .escape(leetcode#utils#accessFiles#readLastFailCase(Q_fullname), '"') .'"'
+    if !a:1
+      if len(a:2)
+        let test_case = a:2
+      elseif len(a:2) == 0 && leetcode#utils#accessFiles#lastFailCaseExists(Q_fullname)
+        let test_case = leetcode#utils#accessFiles#readLastFailCase(Q_fullname)
+      endif
+      let test_cmd .= " -t '\"" .substitute(test_case, "'", "'\"'\"'", 'g') ."\"'"
     en
     cal leetcode#utils#judgeCode#test(test_cmd, Q_fullname)
   cat /.*/ | echoe '[' .g:leetcode_name .'] ' .v:exception | endt

autoload/leetcode/utils/accessFiles.vim

@@ -191,7 +191,7 @@ endfu
 
 fu! leetcode#utils#accessFiles#appendText(file_path, text)
   "" Append text in this way but not in a Vim way to avoid pollution to buffer, jumplist, etc
-  cal system("echo '" .a:text ."' >> '" .a:file_path ."'")
+  cal system("echo '" .substitute(a:text, "'", "'\"'\"'", 'g') ."' >> '" .a:file_path ."'")
 endfu
 
 fu! leetcode#utils#accessFiles#readFile(file_path)

plugin/leetcode.vim

@@ -1,4 +1,4 @@
-"" Version: 0.6.0
+"" Version: 0.6.1
 "" Description:
 "" This is a leetcode question and code file manager. It allows a quick 
 "" download, load, test and submission of leetcode questions. The file