Make the following functions for PART $1$

void destroy$()$;

Stack$()\{/*??????*/\}$

~Stack$()$;

bool empty$()$ const

void push $($const T& val$)$;

void pop$()$;

T& getTop$()$;

const T& getTop$()$ const;

ostream& operator$<<($ostream& o$,$ const Stack& s$)$;