Add project files.

Gold Splitter.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>GoldSplitter</RootNamespace>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Gold Splitter.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32804.467
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Gold Splitter", "Gold Splitter.csproj", "{407290BD-8743-46B1-902B-45AB61C55661}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{407290BD-8743-46B1-902B-45AB61C55661}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{407290BD-8743-46B1-902B-45AB61C55661}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{407290BD-8743-46B1-902B-45AB61C55661}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{407290BD-8743-46B1-902B-45AB61C55661}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {DDD05195-4059-4D20-B784-22830C1B8BC5}
+	EndGlobalSection
+EndGlobal

Program.cs

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+using System;
+
+namespace GoldSplitter;
+using System;
+
+internal static class Program
+{
+	public static NamedAction[] actions =
+	{
+		new ("Split", package =>
+		{
+			Console.WriteLine("Split with how many?");
+			int people = int.Parse(Console.ReadLine() ?? "0");
+			Console.WriteLine(package.Split(people));
+		}),
+		new ("To All Copper", package =>
+		{
+			Console.WriteLine(package.ToAllCopper().Copper);
+		})
+	};
+	static void Main()
+	{
+		GoldPackage gold = GoldPackage.HumanInput();
+		Console.WriteLine("Choose an action:");
+		for (int i = 0; i < actions.Length; i++)
+			Console.WriteLine($"{i + 1}. {actions[i].Name}");
+		actions[int.Parse(Console.ReadLine() ?? "0") - 1].Action.Invoke(gold);
+		Console.ReadLine();
+	}
+}
+public record NamedAction(string Name, Action<GoldPackage> Action);
+public record GoldPackage(int Platinum, int Gold, int Silver, int Copper)
+{
+	public const int copperRepresentative = 1, silverRepresentative = 10, goldRepresentative = 100, platinumRepresentative = 1000;
+	public static explicit operator int(GoldPackage package)
+		=> package.ToAllCopper().Copper;
+	public static GoldPackage HumanInput()
+	{
+		Console.Write("Platinum: ");
+		int plat = int.Parse(Console.ReadLine() ?? "0");
+		Console.Write("Gold: ");
+		int gold = int.Parse(Console.ReadLine() ?? "0");
+		Console.Write("Silver: ");
+		int silver = int.Parse(Console.ReadLine() ?? "0");
+		Console.Write("Copper: ");
+		int copper = int.Parse(Console.ReadLine() ?? "0");
+		return new GoldPackage(plat, gold, silver, copper);
+	}
+
+	public GoldPackage Split(int people)
+	{
+		int copper = ToAllCopper().Copper;
+		copper /= people;
+		return new GoldPackage(0, 0, 0, copper).DisperseToAppropriateCoinValues();
+	}
+	public GoldPackage ToAllCopper() => new(0, 0, 0, (Copper * copperRepresentative) 
+		+ (Silver * silverRepresentative) + (Gold * goldRepresentative) 
+		+ (Platinum * platinumRepresentative));
+	public GoldPackage DisperseToAppropriateCoinValues()
+	{
+		int copperTotal = ToAllCopper().Copper;
+		int platinumOut = copperTotal / platinumRepresentative;
+		copperTotal -= platinumOut * platinumRepresentative;
+		int goldOut = copperTotal / goldRepresentative;
+		copperTotal -= goldOut * goldRepresentative;
+		int silverOut = copperTotal / silverRepresentative;
+		copperTotal -= silverOut * silverRepresentative;
+		int copperOut = copperTotal;
+		return new GoldPackage(platinumOut, goldOut, silverOut, copperOut);
+	}
+}