function extension(attachment) {
    let imageLink = attachment.split('.');
    let typeOfImage = imageLink[imageLink.length - 1];
    let image = /(jpg|jpeg|png|gif)/gi.test(typeOfImage);
    if (!image) return '';
    return attachment;
}
client.on('message', async message => { 
if(message.channel.id === 'hangi kanala yollanınca') {
  let image = message.attachments.size > 0 ? await extension(message.attachments.array()[0].url) : '';
 if (message.attachments.size < 1) return;
const embed = new Discord.RichEmbed()
.setImage(image)
client.channels.get('hangi kanala resim atılacak').send(embed)
}})