Create AdventOfCode.Common.

AdventOfCode.Common/AdventOfCode.Common.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

AdventOfCode.Common/DayHelper.cs

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+namespace AdventOfCode.Common;
+
+public static class DayHelper
+{
+    public static void RunDay(string eventName, int dayNumber)
+    {
+        Console.WriteLine($"Day {dayNumber:00}");
+        Console.WriteLine("------");
+        Console.WriteLine();
+
+        IDay? currentDay = null;
+        Type? dayType = Type.GetType($"{eventName}.Day{dayNumber:00}");
+        if (dayType != null)
+        {
+            currentDay = Activator.CreateInstance(dayType) as IDay;
+        }
+        if (currentDay == null)
+        {
+            Console.WriteLine("!!!!!!!");
+            Console.WriteLine("Day implementation not found.");
+            return;
+        }
+
+        string[] linesDay = File.ReadAllLines($"inputs/Day{dayNumber:00}.txt");
+        try
+        {
+            string resultPart1 = currentDay.ResolvePart1(linesDay);
+            Console.WriteLine("Day{1:00} Result Part1: {0}", resultPart1, dayNumber);
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine(ex.Message);
+            Console.WriteLine(ex.StackTrace);
+        }
+        try
+        {
+            string resultPart2 = currentDay.ResolvePart2(linesDay);
+            Console.WriteLine("Day{1:00} Result Part2: {0}", resultPart2, dayNumber);
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine("!!!!!!!");
+            Console.WriteLine(ex.Message);
+            Console.WriteLine(ex.StackTrace);
+        }
+    }
+}

AdventOfCode.Common/IDay.cs

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+namespace AdventOfCode.Common;
+
+public interface IDay
+{
+    string ResolvePart1(string[] inputs);
+    string ResolvePart2(string[] inputs);
+}