[Mazda48]

Hello,
I need to ask you a question!
I want to add a command like /changeprefix <prefix>, who changed your prefix to what you wrote in <prefix>
I found some code but i cant make to FS..
Here is a code:

PHP код:

if(strcmp(cmd, "/changeprefix", true) == 0)
    {
        if(IsPlayerConnected(playerid))
        {
            if (logged[playerid] == 1)
            {
                if(pInfo[playerid][PREFIXlevel] > 0 ) {
                new length = strlen(cmdtext);
                while ((idx < length) && (cmdtext[idx] <= ' '))
                {
                    idx++;
                }
                new offset = idx;
                new result[256];
                while ((idx < length) && ((idx - offset) < (sizeof(result) - 1)))
                {
                    result[idx - offset] = cmdtext[idx];
                    idx++;
                }
                result[idx - offset] = EOS;
                if(!strlen(result))
                {
                    SendClientMessage(playerid, COLOR_WHITE, "Използвай: /changeprefix [Prefix]");
                    return 1;
                }
                if(strfind( result , "," , true ) == -1)
                {
                       strmid(pInfo[playerid][Prefix], (result), 0, strlen((result)), 129);
                    format(string, sizeof(string), "{FFFFFF}Ти смени своя префикс на: {9AFF00}%s{FFFFFF}.", (result));
                    SendClientMessage(playerid, COLOR_YELLOW, string);
                }
                }
                else
                {
                   SendClientMessage(playerid, COLOR_RED,"Нямаш необходимия левел, за да сменяш префикса си.");
                }
            }
        }
        return 1;
    } 


If this code have a problems pls fix it, im new in pwn so can i ask you to place the .pwn! Please.
And, can only ppls with rcon have permission to use it!