I am getting wrong answer

#1

my linked list is not appended and instead it give me the same output as the input

#2

error is due to your
build list function
it takes more than n inputs and hence k get garbage
so k<n hence you return head in function

  1. 2nd mistake
    when k==n return head;
    when k>n you have to set k=k%n;

Modified Code

#3

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