What is the purpose of the following function:

template

T myfun$($stack& myStack$)\{$

stack tempStack;

T item $=$ myStack.top$()$;

while $(!$myStack.empty$())\{$

T current $=$ myStack.top$()$;

myStack.pop$()$;

if $($current $<$ item$)\{$

item current;

$\}$

tempStack.push$($current$)$;

$\}$

while $(!$tempStack.empty$())\{$

myStack.push$($tempStack$.$top$())$;

tempStack.pop$()$; return item;$\}$

a$.$ Search

Ob$.$ Sort

c$.$ Find maximum

d$.$ Find minimum