please solve

4. Write a method that takes as input a singly linked list and prints the first duplicate number. public void printDuplicate (Node head) { / / to do OR def printDuplicate (head) : pass Sample Input Sample Output 5-4-15-2-3-4 4 6- 6 - 10 -10 - 1-1 - 10- 6 65. Complete the method below that takes the reference of a non-dummy headed singly linear linked list and removes all the nodes containing multiples of 5 from the list. remove_multiple_of_t'lve{head) Sample Input Sample Output 5>6>35 >lO>12>90 612 ll>21>3>43>51 11)2113>43>51 10r20r30r40>50