fix stringutil.java

diff --git a/source/mir/misc/StringUtil.java b/source/mir/misc/StringUtil.java
index 9bfb152..c85d2dd 100755 (executable)
--- a/source/mir/misc/StringUtil.java
+++ b/source/mir/misc/StringUtil.java
@@ -555,8 +555,12 @@ public final class StringUtil {
         }
       }
     }
-    buffer.append(s.substring(stopIndex+1));
-    return buffer.toString();
+    if(stopIndex>0){
+      buffer.append(s.substring(stopIndex+1));
+      return buffer.toString();
+    } else {
+      return s;
+    }
   }
 
   public static String replaceQuot(String s) {