Refactored endpoints to be more functional and more expressive

PostFundManagement.Domain/Errors/CreateError.cs

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+namespace PostFundManagement.Domain.Errors;
+
+public sealed class CreateError : Error
+{
+    public static CreateError New { get; } = new();
+
+    public CreateError() : base(string.Empty) { }
+
+    public CreateError(string message) : base(message) { }
+
+    public static CreateError Create() => new();
+
+    public static CreateError Create(string message) => new(message);
+}

PostFundManagement.Domain/Errors/IdDecodeError.cs

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+namespace PostFundManagement.Domain.Errors;
+
+public sealed class IdDecodeError : Error
+{
+    public static IdDecodeError New { get; } = new();
+
+    public IdDecodeError() : base(string.Empty) { }
+
+    public IdDecodeError(string message) : base(message) { }
+
+    public static IdDecodeError Create() => new();
+
+    public static IdDecodeError Create(string message) => new(message);
+}

PostFundManagement.Domain/Errors/NotFoundError.cs

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+namespace PostFundManagement.Domain.Errors;
+
+public sealed class NotFoundError : Error
+{
+    public static NotFoundError New { get; } = new();
+
+    public NotFoundError() : base(string.Empty) { }
+
+    public NotFoundError(string Message) : base(Message) { }
+
+    public static NotFoundError Create() => new();
+
+    public static NotFoundError Create(string message) => new(message);
+}

PostFundManagement.Domain/Errors/UpdateError.cs

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+namespace PostFundManagement.Domain.Errors;
+
+public sealed class UpdateError : Error
+{
+    public static UpdateError New { get; } = new();
+
+    public UpdateError() : base(string.Empty) { }
+
+    public UpdateError(string message) : base(message) { }
+
+    public static UpdateError Create() => new();
+
+    public static UpdateError Create(string message) => new(message);
+}

PostFundManagement.Domain/Errors/ValidationError.cs

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+namespace PostFundManagement.Domain.Errors;
+
+public sealed class ValidationError : Error
+{
+    public static ValidationError New { get; } = new();
+
+    public ValidationError() : base(string.Empty) { }
+
+    public ValidationError(string message) : base(message) { }
+
+    public static ValidationError Create() => new();
+
+    public static ValidationError Create(string message) => new(message);
+}