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Basic formatting applied. Unnecessary comments have been removed. Suspicious code is covered by TODO.

Hcs.Client/GostXades/Helpers/ArrayHelper.cs

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+using System;
+
+namespace Hcs.GostXades.Helpers
+{
+    public static class ArrayHelper
+    {
+        public static bool AreEquals(byte[] first, byte[] second)
+        {
+            return AreEquals(first, second, (x, y) => x.Equals(y));
+        }
+
+        public static bool AreEquals(string[] first, string[] second)
+        {
+            return AreEquals(first, second, (x, y) => string.Equals(x, y, StringComparison.InvariantCultureIgnoreCase));
+        }
+
+        private static bool AreEquals<T>(T[] first, T[] second, Func<T, T, bool> comparator)
+        {
+            if (first == second)
+            {
+                return true;
+            }
+            if (first.Length != second.Length)
+            {
+                return false;
+            }
+            for (var i = 0; i < first.Length; i++)
+            {
+                var equals = comparator.Invoke(first[i], second[i]);
+                if (!equals)
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+}