inner class viewHolder(view: View) : RecyclerView.ViewHolder(view) {
val image_url: ImageView = view.findViewById(R.id.item_image_url)
.
.
.
override fun onBindViewHolder(holder: viewHolder, position: Int) {
Glide.with(holder.image_url.context)
.load(bookmark[position].image_url)
.into(holder.image_url)