Created linked list will be 11.9 .34 .6 .13 .21
head = push ( head , 21 ) ; NEW_LINE head = push ( head , 13 ) ; NEW_LINE head = push ( head , 6 ) ; NEW_LINE head = push ( head , 34 ) ; NEW_LINE head = push ( head , 9 ) ; NEW_LINE head = push ( head , 11 ) ; NEW_LINE head = delteteEvenParityNodes ( head ) ; NEW_LINE printList ( head ) ; NEW_LINE