Commit day 3 part 1

lib/day3/command.dart

@@ -1,3 +1,4 @@
+import "dart:convert";
 import "dart:io";
 
 import "package:args/command_runner.dart";
@@ -32,5 +33,29 @@ class Day3Command extends Command {
     print("Parsing file: $filePath");
 
     var inputFile = File(filePath);
+    var part1Result = await inputFile
+        .openRead()
+        .transform(utf8.decoder)
+        .transform(LineSplitter())
+        .map((line) {
+          int tens = -1;
+          int ones = -1;
+          final chars = line.split("");
+
+          for (final (idx, char) in chars.indexed) {
+            final char_as_int = int.parse(char);
+            if (char_as_int > tens && idx < chars.length - 1) {
+              tens = char_as_int;
+              ones = -1;
+            } else if (char_as_int > ones) {
+              ones = char_as_int;
+            }
+          }
+
+          return tens * 10 + ones;
+        })
+        .reduce((left, right) => left + right);
+
+    print("Part 1 Answer: $part1Result");
   }
 }