refactor: change type to library and move source

KPO_Lab.sln

@@ -3,7 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.7.34202.233
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "KPO_Lab", "KPO_Lab.csproj", "{73C85CBC-5C3A-4F43-8B10-1462B52F709E}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tool", "Tool/Tool.csproj", "{73C85CBC-5C3A-4F43-8B10-1462B52F709E}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

Tool/Tool.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
+    <OutputType>Library</OutputType>
     <TargetFramework>net7.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

src/Program.cs

@@ -1,7 +0,0 @@
-internal class Program
-{
-  private static void Main(string[] args)
-  {
-    Console.WriteLine("Hello, World!");
-  }
-}