What does doSomething method do assuming heapifyDown$)$ method is already implemented?

void doSomething$($int arr$],$ int n$)$

for $($int i $-$n $-1$; $10$; i$--)$

swap $($arr$[0],$

arr$[$i$])$;

heapifyDown $($arr$,$ i$,)$;

$$ Sorts the array using heap sort

$$ extracts an item, n from the heap

$$ inserts the item, n in a heap

$$ builds a heap in place from an array