Initial

MareSynchronos/Utils/MareInterpolatedStringHandler.cs

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+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace MareSynchronos.Utils;
+
+[InterpolatedStringHandler]
+public readonly ref struct MareInterpolatedStringHandler
+{
+    readonly StringBuilder _logMessageStringbuilder;
+
+    public MareInterpolatedStringHandler(int literalLength, int formattedCount)
+    {
+        _logMessageStringbuilder = new StringBuilder(literalLength);
+    }
+
+    public void AppendLiteral(string s)
+    {
+        _logMessageStringbuilder.Append(s);
+    }
+
+    public void AppendFormatted<T>(T t)
+    {
+        _logMessageStringbuilder.Append(t?.ToString());
+    }
+
+    public string BuildMessage() => _logMessageStringbuilder.ToString();
+}