Refactor Day10 to simplify lamp parsing by removing redundant `.Index()` call and unnecessary LINQ chain

AoC_2025/Day10.cs

@@ -23,9 +23,8 @@ public class Day10 : IPuzzleSolver<long>
             .ToArray();
         var lamps = puzzleInput
             .Select(input => input.lamps)
-            .Select(lamps => lamps.Index())
-            .Select(ixlamps =>
-                ixlamps.Select(ixlamp => ixlamp.Item == '#').ToArray())
+            .Select(lamps =>
+                lamps.Select(lamp => lamp == '#').ToArray())
             .ToArray();
         var buttons = puzzleInput
             .Select(input => input.buttons)