update to .net9 and add cleanup scripts

Author: deckelmouck

adventofcode.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <!-- <LangVersion>latest</LangVersion> -->
   </PropertyGroup>
   <ItemGroup>

cleanup.ps1

@@ -0,0 +1,16 @@
+# Clean the project
+Write-Host "Cleaning the project..."
+dotnet clean
+
+# Remove bin and obj directories
+Write-Host "Removing bin and obj directories..."
+Remove-Item -Recurse -Force bin, obj
+
+# Restore dependencies
+Write-Host "Restoring dependencies..."
+dotnet restore
+
+# Build the project and show target log
+Write-Host "Building the project..."
+dotnet build /tl
+

cleanup.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Bereinigen des Projekts
+echo "Cleaning the project..."
+dotnet clean
+
+# Entfernen von bin und obj Ordnern
+echo "Removing bin and obj directories..."
+rm -rf bin obj
+
+# Wiederherstellen der Abhängigkeiten
+echo "Restoring dependencies..."
+dotnet restore
+
+# Bauen des Projekts und Anzeigen von Zielzeit (tl = TargetLog)
+echo "Building the project..."
+dotnet build /tl
+