Tidy up changes in bin/ directory

Author: MatthewLM

coinlib/bin/build_windows.dart

@@ -1,12 +1,12 @@
 import 'dart:io';
-
 import 'util.dart';
 
 /// Follows bitcoin-core/secp256k1's "Building on Windows" instructions.
 ///
 /// Runnable in "Developer Command Prompt for VS 2022".
 
 void main() async {
+
   // Make temporary directory.
   final workDir = Directory.current.path;
   final tmpDir = createTmpDir();
@@ -60,7 +60,7 @@ void main() async {
     "${Platform.pathSeparator}libsecp256k1-2.dll",
   );
 
-  print("FIle exists: ${dll.existsSync()}");
+  print("File exists: ${dll.existsSync()}");
 
   dll.copySync(
     "$workDir"
@@ -69,4 +69,5 @@ void main() async {
   );
 
   print("Output libsecp256k1.dll successfully");
+
 }

coinlib/bin/util.dart

@@ -14,9 +14,10 @@ Future<bool> cmdAvailable(String cmd) async {
 Future<int> execWithStdio(
   String executable,
   List<String> arguments, {
-  String? workingDir,
-  String? stdin,
-}) async {
+    String? workingDir,
+    String? stdin,
+  }
+) async {
   final process = await Process.start(
     executable,
     arguments,
@@ -44,7 +45,6 @@ Future<int> execWithStdioWin(String command, List<String> arguments) async {
     print('[stderr]: $data');
   });
 
-  // Wait for the process to complete
   return await process.exitCode;
 }