public InlineMenuRowBuilder removeLast(){
  List<InlineMenuButton> buttons=buttons();
  if (buttons.size() != 0)   buttons.remove(buttons.size() - 1);
  return this;
}

public InlineMenuRowBuilder removeLast ( ) { List < InlineMenuButton > buttons = buttons ( ) ; if ( buttons . size ( ) != 0 ) buttons . remove ( buttons . size ( ) - 1 ) ; return this ; }
remove the last button in the stack
