[Mellnik]

Just tested it and it works for me. It looks like you can't return the parameter "string".

Working function for your scenario:

pawn Код:

AddUnderscore(string[])
{
    new manipulated[MAX_PLAYER_NAME];
    for(new i = 0, l = strlen(string); i < l; i++)
    {
        manipulated[i] = string[i];
        if(string[i] == ' ')
        {
            manipulated[i] = '_';
        }
    }
    return manipulated;
}

Btw, why did you add "stock" to the function?