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Billing.Shared/Helper.cs

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+using System;
+
+namespace Billing;
+
+internal static class Helper
+{
+    public static void Debug(string message)
+    {
+        var time = DateTime.Now.ToString("HH:mm:ss.fff");
+        System.Diagnostics.Debug.WriteLine($"[{time}] - {message}");
+    }
+
+    public static void Error(string category, Exception ex)
+    {
+        Error(category, ex?.Message ?? "unknown error");
+    }
+
+    public static void Error(string category, string message)
+    {
+        var time = DateTime.Now.ToString("HH:mm:ss.fff");
+        System.Diagnostics.Debug.Fail($"[{time}] - {category}", message);
+    }
+}