What is problem in my code some test case are pass and some fail

#1 
public void appendLastN(int k) throws Exception {
	 if(k>=this.size) return;
   int n=size-k;
   Node temp=this.head;
   for(int i=0;i<n-1;i++ ) {
	   temp=temp.next;
   }
   Node t=this.head;
   this.head=temp.next;
   temp.next=null;
   temp=this.head;
   while(temp.next!=null) {
	   temp=temp.next;
   }
   temp.next=t;

}

#2

@sksumitkumardiwaker,

Before calling the appendLastN method in main add the following code:
k = k % n;
if (k != 0)
list.appendLastN(k);

In case k>n, we will do k=k%n, because if k is 10, n is 7 this is same as k=3 and n=7. Also, add the if block because only run the code if k is not zero.

#3

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