[RyDeR`]

What about this one?

pawn Code:

stock strReplace(strWhat[], strWith[], strSrc[], strDest[], bool: ignoreCase = false, destSize = sizeof(strDest))
{
    new
        strPos = -1,
        whatLen = strlen(strWhat)
    ;
    memcpy(strDest, strSrc, _, 1 + strlen(strSrc) << 2, destSize);
    
    while((strPos = strfind(strDest, strWhat, ignoreCase, strPos + 1)) != -1)
    {
        strdel(strDest, strPos, strPos + whatLen);
        strins(strDest, strWith, strPos, destSize);
    }
    return ;
}