Functionality Insert user specified data elements using prepending o The user can input as many positive integers as they wish, until a sentinel value (i.e. -1) is entered o Example: . If the user inputs the following integers one-by-one 6, 5, 4, 3, 2, 10,-1 then the linked list (singly, doubly or circular) will contain the elements 10, 2, 3, 4, 5, 6 in that order . -1 is the sentinel value Search for the first instance of a user specified data element O Example: . Assume the linked list (singly, doubly or circular) contains the elements 4, 5,5 in that order . If the user specifies 5 is to be searched for, the function should output that the element exist upon finding the first instance of 5 (i.e. the one next to the 4) If the user specifies 6 is to be searched for, the function should output that the element does not exist