Part 1 & 2

Buckets/Buckets.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Buckets.Logic\Buckets.Logic.csproj" />
+  </ItemGroup>
+
+</Project>

Buckets/Program.cs

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+using Buckets.Logic;
+
+namespace Buckets
+{
+    internal class Program
+    {
+        static void Main()
+        {
+            Bucket bucket = new(50, 0);
+            bucket.Fill(10);
+            bucket.Empty();
+            bucket.Fill(20);
+            bucket.Empty(10);
+
+            OilBarrel oilbarrel = new(0);
+            oilbarrel.Fill(10);
+            oilbarrel.Empty();
+            oilbarrel.Fill(20);
+            oilbarrel.Empty(10);
+
+            Rainbarrel rainbarrel = new(100, 0);
+            rainbarrel.Fill(10);
+            rainbarrel.Empty();
+            rainbarrel.Fill(20);
+            rainbarrel.Empty(10);
+        }
+    }
+}