From d878ab186e173f817efa97ddb9cdb888dee7cd33 Mon Sep 17 00:00:00 2001
From: Sebastian Lindemeier <lindemeier.sebastian@bgetem.de>
Date: Tue, 16 Dec 2025 08:00:03 +0100
Subject: [PATCH] Refactor `Permutations` in `EnumerableExtensions` by
 extracting `RotateIndices` method to simplify and reuse index rotation logic

---
 .../EnumerableExtensions.cs                   | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/AdventOfCode.Extensions/EnumerableExtensions.cs b/AdventOfCode.Extensions/EnumerableExtensions.cs
index 6df27a8..20c5efd 100644
--- a/AdventOfCode.Extensions/EnumerableExtensions.cs
+++ b/AdventOfCode.Extensions/EnumerableExtensions.cs
@@ -117,12 +117,7 @@ public static class EnumerableExtensions
                 cycles[i] -= 1;
                 if (cycles[i] == 0)
                 {
-                    var tmp = indices[i];
-                    for (var j = i; j < indices.Length - 1; j++)
-                    {
-                        indices[j] = indices[j + 1];
-                    }
-                    indices[^1] = tmp;
+                    RotateIndices(indices, i);
                     cycles[i] = poolLength - i;
                 }
                 else
@@ -135,6 +130,18 @@ public static class EnumerableExtensions
                 }
             }
         }
+
+        yield break;
+
+        static void RotateIndices(int[] indices, int from)
+        {
+            var tmp = indices[from];
+            for (var j = from; j < indices.Length - 1; j++)
+            {
+                indices[j] = indices[j + 1];
+            }
+            indices[^1] = tmp;
+        }
     }
     
     private static TValue[] GetCombination<TValue>(int[] innerIndices, TValue[] innerPool) =>