AIO commit

Sorry for the late commit, forgot to commit and push it on Saturday 7th.
Thank god there are moodle reminders

AdventOfCode/AdventOfCode.Test/Day3Test.cs

@@ -0,0 +1,28 @@
+namespace AdventOfCode.Test;
+
+public sealed class Day3Test
+{
+    [Fact]
+    public void Part1()
+    {
+        const string Input = "xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))";
+        const int Expected = 161;
+        var day3 = new Day3();
+        
+        var result = day3.Part1(Input);
+        
+        Assert.Equal(Expected, result);
+    }
+    
+    [Fact]
+    public void Part2()
+    {
+        const string Input = "xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))";
+        const int Expected = 48;
+        var day3 = new Day3();
+        
+        var result = day3.Part2(Input);
+        
+        Assert.Equal(Expected, result);
+    }
+}