$15\mathrm{.}2\mathrm{.}3$: Remove and return the last element of a linked list.

Complete this method for removing and returning the last element of a linked list. If the list is empty, return null.

import java.util.Iterator;

import java.util.LinkedList;

public class Lists

$\{$

public static String removeLast$($LinkedList strings$)$

$\{$

Iterator iter $=$ strings.iterator$()$;

String result $=$ null;

$/*$ Your code goes here $*/$

return result;

$\}$

$\}$

$591354\mathrm{.}3921188.$ qx $\backslash (3$ z q $7\backslash )$

Complete this method for removing and returning the last element of a linked list. If the list is empty, return null.

$```$

$\{$

LinkedList lst$1$

$=$ new LinkedListArrays$.$asList$("$Peter$",$ "Paul", "Mary"$))$;

String res$1=$ Lists.removeLast$($lst$1)$;

System.out.println$($res$1)$;

System.out.println$("$Expected: Mary"$)$;

System.out.println$($lst$1)$;

System.out.println$("$Expected: $[$Peter$,$ Paul$]")$;

LinkedList lst$2$

$=$ new LinkedListArrays$.$asList$("$A$","$B$","$C$","$D$","$E$"))$;

String res$2=$ Lists.removeLast$($lst$2)$;

System.out.println$($res$2)$;

System.out.println$("$Expected: E$")$;

System.out.println$($lst$2)$;

System.out.println$("$Expected: $[$A$,$ B$,$ C$,$ D$]")$;

$\}$

$\}$

$```$