mpp name change command

if (b ==prefix + "cn") { //dont change that cn to change name or other
    const send = MPP.chat.send;
    let own = MPP.client.getOwnParticipant();
    let yourid = own._id;
    let userid = msg.p._id;
    if (userid != yourid) return send("You dont have any permission to use this command");
    let prefix = "&";
    let userinput = msg.a.substring(5);
    let username = msg.p.name;
    if (userinput == "") return send(`${username} please enter name to change name, usage: ${prefix}cn [newname]`);
    MPP.client.sendArray([{m: "userset",set: {name: userinput}}]);
    send(`${username} changed his name to ${userinput}`);
}