diff --git a/source/Cosmos.System.Plugs/Cosmos.System.Plugs.csproj b/source/Cosmos.System.Plugs/Cosmos.System.Plugs.csproj
index 4b1ce68e7..28b7edbad 100644
--- a/source/Cosmos.System.Plugs/Cosmos.System.Plugs.csproj
+++ b/source/Cosmos.System.Plugs/Cosmos.System.Plugs.csproj
@@ -12,14 +12,10 @@
     <AssemblyName>Cosmos.System.Plugs</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
-    <SccProjectName>
-    </SccProjectName>
-    <SccLocalPath>
-    </SccLocalPath>
-    <SccAuxPath>
-    </SccAuxPath>
-    <SccProvider>
-    </SccProvider>
+    <SccProjectName>SAK</SccProjectName>
+    <SccLocalPath>SAK</SccLocalPath>
+    <SccAuxPath>SAK</SccAuxPath>
+    <SccProvider>SAK</SccProvider>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>Cosmos.snk</AssemblyOriginatorKeyFile>
     <TargetFrameworkProfile />
@@ -86,7 +82,6 @@
     <Compile Include="System\IO\PathImpl.cs" />
     <Compile Include="System\IO\StreamReaderImpl.cs" />
     <Compile Include="System\RandomImpl.cs" />
-    <Compile Include="System\StringImpl.cs" />
     <Compile Include="System\Text\DecoderFallbackImpl.cs" />
     <Compile Include="System\Text\EncoderFallbackImpl.cs" />
     <Compile Include="System\Text\ASCIIEncodingImpl.cs" />
diff --git a/source/Cosmos.System.Plugs/System/StringImpl.cs b/source/Cosmos.System.Plugs/System/StringImpl.cs
deleted file mode 100644
index cd4f94655..000000000
--- a/source/Cosmos.System.Plugs/System/StringImpl.cs
+++ /dev/null
@@ -1,96 +0,0 @@
-using Cosmos.IL2CPU.Plugs;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Plug = Cosmos.IL2CPU.Plugs.PlugAttribute;
-
-namespace Cosmos.System.Plugs.System
-{
-    [@Plug(Target = typeof(string))]
-    public static class StringImpl
-    {
-        public static bool StartsWith(this string str, string value)
-        {
-            Char[] di = str.ToCharArray();
-            Char[] ci = value.ToCharArray();
-            if (value.Length > str.Length)
-            {
-                return false;
-            }
-            for (int i = 0; i < ci.Length; i++)
-            {
-                if (di[i] != ci[i])
-                {
-                    return false;
-                    
-                }
-            }
-            return true;
-        }
-
-        public static bool Contains(this string str, string comp)
-        {
-            Char[] di = str.ToCharArray();
-            Char[] ci = comp.ToCharArray();
-            if (comp.Length == str.Length)
-            {
-                if (comp == str)
-                {
-                    return true;
-                }
-                else
-                {
-                    return false;
-                }
-            }
-            else if (!(comp.Length > str.Length) && (comp.Length != str.Length))
-            {
-                for (int i = 0; i < str.Length; i++)
-                {
-                    if (di[i] == ci[0])
-                    {
-                        for (int j = 1; j < comp.Length; j++)
-                        {
-                            if (di[i + j] != ci[j])
-                            {
-                                return false;
-                            }
-                        }
-                        return true;
-                    }
-                }
-            }
-            return false;
-        }
-        public static bool EndsWith(this string str, string comp)
-        {
-            Char[] di = str.ToCharArray();
-            Char[] ci = comp.ToCharArray();
-            if(str.Length == comp.Length)
-            {
-                if(str == comp)
-                {
-                    return true;
-                }
-                return false;
-            }
-            else if(comp.Length > str.Length)
-            {
-                return false;
-            }
-            else
-            {
-                for (int i = str.Length - comp.Length; i < str.Length; i++)
-                {
-                    if (di[str.Length - comp.Length + i] != ci[i])
-                    {
-                        return false;
-                    }
-                }
-                return true;
-            }
-        }
-    }
-}