[Pharrel]

pawn Код:

forward ReturnStringWithoutBadSign(string[]);
public ReturnStringWithoutBadSign(string[])
{
for(new i=0; i<strlen(string); i++)
{
if(string[i] == '%') string[i] = '#';
}
return string;
}

Then use
[pawn]SendClientMessage(playerid, COLOR, ReturnStringWithoutBadSign(string));//i'm not sure if that works but in theory seems yes...

@edited