[Scenario]

This is honestly as "clean" as the command can be:

pawn Код:

#define COLOR_ME 0xFFFFFF // What is the color going to be for the sent message? Currently, it's set to white.

CMD:me(playerid, params[])
{
    if(isnull(params)) // Did they enter an action?
        return SendClientMessage(playerid, 0xFFFFFF, "SYNTAX: /me [action]");
    if(strlen(params) > 124) // Is the action too long (aka. will it fit in a single message)?
        return SendClientMessage(playerid, 0xFFFFFF, "SYSTEM: Your /me action is too long.");
        
    new szString[128];
    format(szString, sizeof(szString), "* %s %s", GetName(playerid), params); // formatting the string
    SendClientMessage(playerid, COLOR_ME, szString);
    return 1;
}

stock GetName(playerid) // This function is quite useful.
{
    new szName[25];
    GetPlayerName(playerid, szName, sizeof(szName));
    return szName;
}

It is pointless to use sscanf for such a simple command. You could also do this with strcmp-based commands, but I find it easier to use ZCMD. Keep in mind, ZCMD is the fastest command processor around if you are going to have under 100 commands. Otherwise, use YCMD.