Need help in java please!!!! I dont know why I cant get $100$ on the rubric

The starter project is provided for the LinkedBag class. The class includes a method for adding

elements to the bag. Your task is to complete the merge$($LinkedBag other$)$method in this class,

which takes another bag as an argument and merges it with the current bag.

You are required to run the GradingRubric class to make sure your method works as intended.

You are required to:

$$Understand the provided LinkedBag class.

$$Implement the merge$($LinkedBag other$)$method$,$ which should merge the current bag with the provided bag $$other$.$

$$Ensure your merge$()$method works in place, modifying the linked structure without creating additional arrays or collections.

$$The merged bag should allow duplicates from both bags.

BagInterface.java

public interface BagInterface $\{$

$$ boolean add$($T newEntry$)$;

$$ int getCurrentSize$()$;

$$ boolean isEmpty$()$;

$\}$

Main.java

public class Main $\{$

$$ public static void main$($String$[]$args$)\{$

$//$init an instance of a bag.

$$ LinkedBag myLBag $=$new LinkedBag$<>()$;

$\}$

$\}$

LinkedBag.java

public class LinkedBag implements BagInterface $\{$

$//$node class

$$ private class Node $\{$

$//$instance variables

$$ T data;

$$ Node next;

$//$constructor

$$ public Node$($T data, Node next$)\{$

$$ this.data $=$data;

$$ this.next $=$next;

$\}$

$\}$

$//$instance variables

$$ private Node firstNode;

$$ private int numberOfEntries;

$$ public LinkedBag$()\{$

$$ firstNode $=$null;

$$ numberOfEntries $=0$;

$\}$

$$ public String print$\_$list$()\{$

$$ Node temp $=$firstNode;

$$ String result $=""$;

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

$$ result $+=$temp$.$data $+"==>"$;

$$ temp $=$temp$.$next;

$\}$

$$ result $+="$null$"$;

$$ return result;

$\}$

@Override

public boolean add$($T newEntry$)\{$

Node newNode $=$ new Node$($newEntry$,$ firstNode$)$;

firstNode $=$ newNode;

numberOfEntries$++$;

return true;

$\}$

@Override

public int getCurrentSize$()\{$

return numberOfEntries;

$\}$

@Override

public boolean isEmpty$()\{$

return numberOfEntries $==0$;

$\}$

$//$ Method to merge another LinkedBag into this LinkedBag

public void merge$($LinkedBag other$)\{$

if $($other$.$isEmpty$())\{$

return; $//$ No need to merge if other is empty

$\}$

if $($this$.$isEmpty$())\{$

this.firstNode $=$ other.firstNode; $//$ If current bag is empty, just point to the other bag's nodes

$\}$ else $\{$

Node current $=$ other.firstNode;

while $($current $!=$ null$)\{//$ Add all nodes from the other bag to this bag

this.add$($current$.$data$)$;

current $=$ current.next;

$\}$

$\}$

this.numberOfEntries $+=$ other.numberOfEntries; $//$ Update the number of entries

$\}$

$\}$

GradingRubric.java

public class GradingRubric $\{$

$$ public static void main$($String$[]$args$)\{$

$$ int totalPoints $=0$;

$//$Test $1$: Merging two non$-$empty bags $($Simple Case$)$

$$ LinkedBag bag$1=$new LinkedBag$<>()$;

$$ LinkedBag bag$2=$new LinkedBag$<>()$;

$$ bag$1.$add$(1)$;

$$ bag$1.$add$(2)$;

$$ bag$1.$add$(3)$;

$$ bag$2.$add$(4)$;

$$ bag$2.$add$(5)$;

$$ bag$2.$add$(6)$;

$$ bag$1.$merge$($bag$2)$;

$$ if $($bag$1.$print$\_$list$().$equals$("3==>2==>1==>6==>5==>4==>$null$"))\{$

$$ System.out.println$("$Test $1$passed$")$;

$$ totalPoints $+=10$;

$\}$else $\{$

$$ System.out.println$("$Test $1$failed$")$;

$\}$

$//$Test $2$: Merging a non$-$empty bag with an empty bag

$$ LinkedBag bag$3=$new LinkedBag$<>()$;

$$ LinkedBag bag$4=$new LinkedBag$<>()$;

$$ bag$3.$add$(1)$;

$$ bag$3.$add$(2)$;

$$ bag$3.$add$(3)$;

$$ bag$3.$merge$($bag$4)$;

$$ if $($bag$3.$print$\_$list$().$equals$("3==>2==>1==>$null$"))\{$

$$ System.out.println$("$Test $2$passed$")$;

$$ totalPoints $+=10$;

$\}$else $\{$

$$ System.out.println$("$Test $2$failed$")$;

$\}$

$//$Test $3$: Merging an empty bag with a non$-$empty bag

$$ LinkedBag bag$5=$new LinkedBag$<>()$;

$$ LinkedBag bag$6=$new LinkedBag$<>()$;

$$ bag$6.$add$(4)$;

$$ bag$6.$add$(5)$;

$$ bag$6.$add$(6)$;

$$ bag$5.$merge$($bag$6)$;

$$ if $($bag$5.$print$\_$list$().$equals$("6==>5==>4==>$null$"))\{$

$$ System.out.println$("$Test $3$passed$")$;

$$ totalPoints $+=10$;

$\}$else $\{$

$$ System.out.println$("$Test $3$failed$")$;

$\}$

$//$Test $4$: Merging two empty bags

$$ LinkedBag bag$7=$new LinkedBag$<>()$;

$$ LinkedBag bag$8=$new LinkedBag$<>()$;

$$ bag$7.$merge$($bag$8)$;

$$ if $($bag$7.$print$\_$list$().$equals$("$null$"))\{$

$$ System.out.println$("$Test $4$passed$")$;

$$ totalPoints $+=10$;

$\}$else $\{$

$$ System.out.println$("$Test $4$failed$")$;

$\}$

$//$NEW Test $5$: Merging bags with non$-$overlapping elements

$$ LinkedBag bag$9=$new LinkedBag$<>()$;

$$ LinkedBag bag$10=$new LinkedBag$<>()$;

$$ bag$9.$add$(100)$;

$$ bag$9.$add$(200)$;

$$ bag$10.$add$(300)$;

$$ bag$1$