【轻量级 PR】：简化return

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/text/Convert.java

@@ -962,9 +962,7 @@ public class Convert
                 c[i] = (char) (c[i] - 65248);
             }
         }
-        String returnString = new String(c);
-
-        return returnString;
+        return new String(c);
     }
 
     /**