Day 3 code clean up

Day3/Program.cs

@@ -1,7 +1,6 @@
 using System.Text.RegularExpressions;
 
 var memory = File.ReadAllText("input.txt");
-        
 var result = ParseCorruptedMemory(memory);
 var resultPart2 = ParseCorruptedMemoryPart2(memory);
 Console.WriteLine($"Part1: {result}\nPart2: {resultPart2}");
@@ -35,8 +34,8 @@ int ParseCorruptedMemoryPart2(string corruptedMemory)
     var dontMatches = Regex.Matches(corruptedMemory, dontPattern);
     
     var allMatches = mulMatches
-        .Concat(doMatches.Cast<Match>())
+        .Concat(doMatches)
-        .Concat(dontMatches.Cast<Match>())
+        .Concat(dontMatches)
         .OrderBy(m => m.Index)
         .ToList();
     
@@ -54,9 +53,8 @@ int ParseCorruptedMemoryPart2(string corruptedMemory)
         }
         else if (Regex.IsMatch(match.Value, mulPattern) && mulEnabled)
         {
-            var mulMatch = (Match)match;
+            var x = int.Parse(match.Groups[1].Value);
-            var x = int.Parse(mulMatch.Groups[1].Value);
+            var y = int.Parse(match.Groups[2].Value);
-            var y = int.Parse(mulMatch.Groups[2].Value);
             results.Add(x * y);
         }
     }