Extract Combinations method to AdventOfCode.Extensions and refactor usages to improve modularity and reduce duplication

AoC_2025/Day08.cs

@@ -4,6 +4,7 @@ using System.Data.Common;
 using System.IO;
 using System.Linq;
 using AdvenOfCode.Contracts;
+using AdventOfCode.Extensions;
 using Coordinate = (long x, long y, long z);
 
 namespace AoC_2025;
@@ -92,21 +93,11 @@ public class Day08 : IPuzzleSolver<long>
 
     private IEnumerable<(Coordinate boxA, Coordinate boxB)> GetAllCombinationsSortedByDistance(IEnumerable<Coordinate> jBoxes)
     {
-        var combinations = Combinations(jBoxes)
+        var combinations = jBoxes.Combinations(2)
+            .Select(x => (a: x[0], b: x[1]))
             .OrderBy(x => GetDistance(x.a, x.b));
         return combinations;
     }
-
-    private IEnumerable<(TValue a, TValue b)> Combinations<TValue>(IEnumerable<TValue> values)
-    {
-        var enumeratedValues = values.Index().ToArray();
-        var pairs = 
-            from a in enumeratedValues
-            from b in enumeratedValues
-            where a.Index < b.Index
-            select (a.Item, b.Item);
-        return pairs;
-    }
     
     private long MultiplyLargestCircuitLength(List<HashSet<Coordinate>> circuits, int amountMultiply)
     {