public OnPluginStart()
{
    AddCommandListener(CommandListener);
}

public Action:CommandListener(client, const String:command[], args)
{
    if (StrEqual(command, "callvote", false))
    {
        new String:arg1[16];
        GetCmdArg(1, arg1, sizeof(arg1));
        if (StrEqual(arg1, "restartgame", false))
        {
            decl String:map[75];
            GetCurrentMap(map, 75);
            if(StrContains(map, "m1") != -1)
            {
                return Plugin_Handled;
            }
        }
    }
    return Plugin_Continue;
}