Refactor code structure for improved readability and maintainability; optimize performance in key functions.

src/__Libraries/StellaOps.Canonicalization/Culture/InvariantCulture.cs

@@ -0,0 +1,48 @@
+using System.Globalization;
+using System.Text;
+
+namespace StellaOps.Canonicalization.Culture;
+
+/// <summary>
+/// Ensures all string operations use invariant culture.
+/// </summary>
+public static class InvariantCulture
+{
+    public static IDisposable Scope()
+    {
+        var original = CultureInfo.CurrentCulture;
+        CultureInfo.CurrentCulture = CultureInfo.InvariantCulture;
+        CultureInfo.CurrentUICulture = CultureInfo.InvariantCulture;
+        return new CultureScope(original);
+    }
+
+    public static int Compare(string? a, string? b) => string.Compare(a, b, StringComparison.Ordinal);
+
+    public static string FormatDecimal(decimal value) => value.ToString("G", CultureInfo.InvariantCulture);
+
+    public static decimal ParseDecimal(string value) => decimal.Parse(value, CultureInfo.InvariantCulture);
+
+    private sealed class CultureScope : IDisposable
+    {
+        private readonly CultureInfo _original;
+        public CultureScope(CultureInfo original) => _original = original;
+        public void Dispose()
+        {
+            CultureInfo.CurrentCulture = _original;
+            CultureInfo.CurrentUICulture = _original;
+        }
+    }
+}
+
+/// <summary>
+/// UTF-8 encoding utilities.
+/// </summary>
+public static class Utf8Encoding
+{
+    public static string Normalize(string input)
+    {
+        return input.Normalize(NormalizationForm.FormC);
+    }
+
+    public static byte[] GetBytes(string input) => Encoding.UTF8.GetBytes(Normalize(input));
+}