fix: normalize path to fix building .apk on Windows

- fixes #1741

brut.j.dir/src/main/java/brut/directory/ZipUtils.java

@@ -54,7 +54,8 @@ public class ZipUtils {
             throws BrutException, IOException {
         for (final File file : folder.listFiles()) {
             if (file.isFile()) {
-                final ZipEntry zipEntry = new ZipEntry(BrutIO.sanitizeUnknownFile(folder, file.getPath().substring(prefixLength)));
+                final String normalizedPath = BrutIO.normalizePath(file.getPath().substring(prefixLength));
+                final ZipEntry zipEntry = new ZipEntry(BrutIO.sanitizeUnknownFile(folder, normalizedPath));
 
                 // aapt binary by default takes in parameters via -0 arsc to list extensions that shouldn't be
                 // compressed. We will replicate that behavior

brut.j.util/src/main/java/brut/util/BrutIO.java

@@ -97,6 +97,16 @@ public class BrutIO {
         return canonicalEntryPath.substring(canonicalDirPath.length());
     }
 
+    public static String normalizePath(String path) {
+        char separator = File.separatorChar;
+
+        if (separator != '/') {
+            return path.replace(separator, '/');
+        }
+
+        return path;
+    }
+
     public static void copy(File inputFile, ZipOutputStream outputFile) throws IOException {
         try (
                 FileInputStream fis = new FileInputStream(inputFile)