public final class Contract {
    public static final class Contacts {
        public static final String NAME = "Name"
        public static final String BIRTH = "Birth"
        public static final String IMAGE = "Image"
    }
}

object BirthdayContract {
    class Contacts : BaseColumns {
        companion object {
            val NAME = "Name"
            val BIRTH = "Birth"
            val IMAGE = "Image"
        }
    }
}