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SecureBank.Extensions/StringExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SecureBank.Extensions
+{
+    public static class StringExtensions
+    {
+        public static string CreateRandom(int length) => CreateRandom(length, "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890`~!@#$%^&*()-_=+[{]};:'\"\\|,<.>/?");
+        public static string CreateRandom(int length, IEnumerable<char> characters) => new string(Enumerable.Repeat(characters, length).Select(s => s.ElementAt(Random.Shared.Next(s.Count()))).ToArray());
+
+        public static string Shuffle(this string str)
+        {
+            char[] array = str.ToCharArray();
+            Random rng = Random.Shared;
+            int n = array.Length;
+            while (n > 1)
+            {
+                n--;
+                int k = rng.Next(n + 1);
+                char value = array[k];
+                array[k] = array[n];
+                array[n] = value;
+            }
+            return new string(array);
+        }
+    }
+}