I need help implementing this code for my PROJECT please help. This is the requrment. : You are required to use the List interface from the textbook. Additionally, you are required to use the Link class for doubly$-$linked nodes $($which is different than the Link class for the practice assignments$).$ Furthermore, you are required to start with the textbook's implementation of a doubly$-$linked list, the DLList class, but are not allowed to use a header node nor a trailer node $($so remove the code that creates them$).$ Name your class BasicDLList. Modify your BasicDLList class so that the results of each method are identical with those of the DLList class. Extend your MenuDriver class from Project $1$ by adding in code to create a BasicDLList object and calls its methods. Additionally, add in an option for $"$V$",$ that calls the BasicDLList.toString method to list all of the strings in a comma$-$seperated list. THis is my code I have now below, I need help with implemeting the link class,it is in the SCREENSHOT, I keep geeting errors about duplication of the class link when I submit it into an auto grade. Any changes made are welcome aslong as they follow the above requirments Thank you. class Link$$ import java.util.NoSuchElementException;

public class BasicDLList implements List $\{$

private Link head; $//$ Pointer to first element

private Link tail; $//$ Pointer to last element

private Link curr; $//$ Access to current element

private int listSize; $//$ Size of list

public BasicDLList$()\{$

clear$()$;

$\}$

public void clear$()\{$

head $=$ tail $=$ curr $=$ null; $//$ No header or trailer

listSize $=0$;

$\}$

public boolean insert$($E it$)\{$

if $($curr $==$ null$)\{//$ List is empty

curr $=$ head $=$ tail $=$ new Link$($it$,$ null, null$)$;

$\}$ else $\{$

Link tmp $=$ new Link$($it$,$ curr.prev$(),$ curr$)$;

if $($curr$.$prev$()!=$ null$)\{$

curr.prev$().$setNext$($tmp$)$;

$\}$ else $\{$

head $=$ tmp;

$\}$

curr.setPrev$($tmp$)$;

if $($curr $==$ head$)\{$

head $=$ tmp;

$\}$

$\}$

listSize$++$;

return true;

$\}$

public boolean append$($E it$)\{$

if $($tail $==$ null$)\{//$ List is empty

curr $=$ head $=$ tail $=$ new Link$($it$,$ null, null$)$;

$\}$ else $\{$

Link tmp $=$ new Link$($it$,$ tail, null$)$;

tail.setNext$($tmp$)$;

tail $=$ tmp;

$\}$

listSize$++$;

return true;

$\}$

public E remove$()$ throws NoSuchElementException $\{$

if $($curr $==$ null$)\{$

throw new NoSuchElementException$("$List is empty."$)$;

$\}$

E it $=$ curr.element$()$;

if $($curr $==$ head$)\{$

head $=$ head.next$()$;

if $($head $!=$ null$)\{$

head.setPrev$($null$)$;

$\}$

$\}$ else if $($curr $==$ tail$)\{$

tail $=$ tail.prev$()$;

tail.setNext$($null$)$;

$\}$ else $\{$

curr.prev$().$setNext$($curr$.$next$())$;

curr.next$().$setPrev$($curr$.$prev$())$;

$\}$

if $($curr $==$ tail$)\{$

curr $=$ null; $//$ Removed last element

$\}$ else $\{$

curr $=$ curr.next$()$;

$\}$

listSize$--$;

return it;

$\}$

public void moveToStart$()\{$

curr $=$ head;

$\}$

public void moveToEnd$()\{$

curr $=$ tail;

$\}$

public void prev$()\{$

if $($curr $!=$ head$)\{$

curr $=$ curr.prev$()$;

$\}$

$\}$

public void next$()\{$

if $($curr $!=$ tail$)\{$

curr $=$ curr.next$()$;

$\}$

$\}$

public int length$()\{$

return listSize;

$\}$

public int currPos$()\{$

Link temp $=$ head;

int i;

for $($i $=0$; temp $!=$ null && temp $!=$ curr; i$++)\{$

temp $=$ temp.next$()$;

$\}$

return i;

$\}$

public boolean moveToPos$($int pos$)\{$

if $($pos $<mtext\; id="EditorElement\_3315858"></mtext><mn\; id="EditorElement\_3315859">0</mn><mtext\; id="EditorElement\_3315860"></mtext><mi\; id="EditorElement\_3315861">|</mi><mi\; id="EditorElement\_3315862">|</mi>$ pos $>=$ listSize$)\{$

return false;

$\}$

curr $=$ head;

for $($int i $=0$; i $$ pos; i$++)\{$

curr $=$ curr.next$()$;

$\}$

return true;

$\}$

public boolean isAtEnd$()\{$

return curr $==$ tail;

$\}$

public E getValue$()$ throws NoSuchElementException $\{$

if $($curr $==$ null$)\{$

throw new NoSuchElementException$("$No current element."$)$;

$\}$

return curr.element$()$;

$\}$

public boolean isEmpty$()\{$

return listSize $==0$;

$\}$

@Override

public String toString$()\{$

StringBuilder sb $=$ new StringBuilder$()$;

sb$.$append$("|")$;

Link temp $=$ head;

while $($temp $!=$ null$)\{$

sb$.$append$($temp$.$element$())$;

if $($temp$.$next$()!=$ null$)\{$

sb$.$append$(",")$;

$\}$

temp $=$ temp.next$()$;

$\}$

sb$.$append$("")$;

return sb$.$toString$()$;

$\}$

$\}$