fixed

Sieve/Models/RemoveVietNamSign.cs

@@ -39,7 +39,7 @@ namespace Sieve.Models
 
             "ÝỲỴỶỸ"
            };
-        public string RemoveSignAndLowerCase4VietnameseString(string str)
+        public string RemoveSignVietnameseString(string str)
         {
             for (int i = 1; i < VietnameseSigns.Length; i++)
             {