diff --git a/lib/string_calculator.dart b/lib/string_calculator.dart
index 9f7bc8c..6e5ec31 100644
--- a/lib/string_calculator.dart
+++ b/lib/string_calculator.dart
@@ -7,6 +7,7 @@
 /// 3. Two numbers comma-delimited returns sum
 /// 4. Handle newlines as delimiters
 /// 5. Support custom delimiters: "//[delimiter]\n[numbers]"
+library;
 
 class StringCalculator {
   int add(String numbers) {
@@ -16,7 +17,9 @@ class StringCalculator {
     }
 
     // Bug 2: Single number parsing
-    if (!numbers.contains(',') && !numbers.contains('\n') && !numbers.startsWith('//')) {
+    if (!numbers.contains(',') &&
+        !numbers.contains('\n') &&
+        !numbers.startsWith('//')) {
       return int.parse(numbers); // Fixed: Removed off-by-one error
     }
 
@@ -42,7 +45,8 @@ class StringCalculator {
 
     // Bug 3: Off-by-one in summation
     int sum = 0;
-    for (int i = 0; i < numList.length; i++) { // Fixed: Include last element
+    for (int i = 0; i < numList.length; i++) {
+      // Fixed: Include last element
       sum += numList[i];
     }
 
diff --git a/test/string_calculator_test.dart b/test/string_calculator_test.dart
index 65ca2d9..1d4ee44 100644
--- a/test/string_calculator_test.dart
+++ b/test/string_calculator_test.dart
@@ -1,5 +1,5 @@
-import 'package:test/test.dart';
 import 'package:tdd_katas/string_calculator.dart';
+import 'package:test/test.dart';
 
 void main() {
   group('String Calculator - Bug Hunt', () {