Add Duplicate Character Counter in Beef

archive/b/beef/DuplicateCharacterCounter.bf

@@ -0,0 +1,58 @@
+using System;
+
+namespace DuplicateCharacterCounter;
+
+class Program
+{
+    public static void Usage()
+    {
+        Console.WriteLine("Usage: please provide a string");
+        Environment.Exit(0);
+    }
+
+    public static void CountDuplicateCharacters(StringView str, uint[] dupeCounter)
+    {
+        for (int i < 256)
+        {
+            dupeCounter[i] = 0;
+        }
+
+        for (char8 ch in str)
+        {
+            dupeCounter[(int)ch]++;
+        }
+    }
+
+    public static void ShowDuplicateCharacterCounts(StringView str, uint[] dupeCounter)
+    {
+        bool hasDupes = false;
+        for (char8 ch in str)
+        {
+            uint dupeCount = dupeCounter[(int)ch];
+            if (dupeCount > 1)
+            {
+                Console.WriteLine($"{ch}: {dupeCount}");
+                dupeCounter[(int)ch] = 0; // Indicate character already seen
+                hasDupes = true;
+            }
+        }
+
+        if (!hasDupes)
+        {
+            Console.WriteLine("No duplicate characters");
+        }
+    }
+
+    public static int Main(String[] args)
+    {
+        if (args.Count < 1 || args[0].Length < 1)
+        {
+            Usage();
+        }
+
+        uint[] dupeCounter = scope uint[256];
+        CountDuplicateCharacters(args[0], dupeCounter);
+        ShowDuplicateCharacterCounts(args[0], dupeCounter);
+        return 0;
+    }
+}