Starboard for Fletcher

@bot.command(aliases=['snipe'])
async def star(ctx, messageid : str=None):
    try:
    for messageid in ctx.message.channel.history:
        starmessage = ctx.channel.get_message(messageid)
            if ctx.author == starmessage.author:
                return 'Cannot star your own message.'
                return
        starboard = ctx.guild.get_channel(channelid)
        embed = discord.Embed()
        embed.set_author(name=starmessage)
        embed.add_field(name=ctx.author, value = messageid)
        await starboard.send(embed=embed)
    except:
        await ctx.send('Message not found!')