I newby in bash. I want to add some files into file (apk file):

PACKAGE_NAME="com.example.myapp"
MAIN_ACTIVITY="MainActivity"
BUILD_DIR="/storage/emulated/0/Documents/GenCoreLite/scripts/build"
OUTPUT_DIR="/storage/emulated/0/Documents/GenCoreLite/scripts/output"

MAIN_ACTIVITY_CODE="
package $PACKAGE_NAME;

import android.app.Activity;
import android.os.Bundle;

public class $MAIN_ACTIVITY extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Тут можна додати ваш код
    }
}
"

#Adding data into file
echo "$MAIN_ACTIVITY_CODE" > $SOURCE_DIR/$(echo $PACKAGE_NAME | tr '.' '/')/$MAIN_ACTIVITY.java

#compiling java file
ecj -d $BUILD_DIR $SOURCE_DIR/$(echo $PACKAGE_NAME | tr '.' '/')/$MAIN_ACTIVITY.java

#confert to dex file
d8 $BUILD_DIR/$(echo $PACKAGE_NAME | tr '.' '/')/*.class --output $BUILD_DIR

#Adding dex file to apk file
cd $BUILD_DIR
if [ -f "$OUTPUT_DIR/$APP_NAME-unsigned.apk" ]; then
    echo "=== Видалення старого DEX файла з APK ==="
    zip -d $OUTPUT_DIR/$APP_NAME-unsigned.apk "classes.dex"
    if [ $? -ne 0 ]; then
        echo "Помилка видалення старого DEX файла"
        exit 1
    fi

    echo "=== Додавання нового DEX файла до APK ==="
    zip -j $OUTPUT_DIR/$APP_NAME-unsigned.apk "$BUILD_DIR/classes.dex"
    if [ $? -ne 0 ]; then
        echo "Помилка додавання DEX файла в APK"
        exit 1
    fi
else
    echo "Помилка: APK файл не знайдено"
    exit 1
fi

I my case i have troubles that classes.dex file was added into apk file with folders (/storage/emulated/0/…/build/classes.dex

But i need that classes.dex was added in apk file like that