fixed

    delete[] _Value;

    delete[] _Help;

    Cmd *reg=_nextCmd;

    Cmd *cur=_nextCmd;;

    _nextCmd=nullptr;

    while(reg){

        Cmd *cur=reg->_nextCmd;

        reg->_nextCmd=nullptr;

        delete reg->_nextCmd;

        reg=cur;

    while(cur){

        Cmd *next=cur->_nextCmd;

        cur->_nextCmd=nullptr;

        delete cur->_nextCmd;

        cur=next;

    }

}