Take the Singly linked-list class from Github.

Link: https://github.com/phitronio/Data-Structure-Batch2/blob/main/Week%204/Module%2013/1.cpp

Add the following functions to the class.

int getLast() -> This function will return the last node of the linked list. If the linked list is empty then return -1.

Sample Input: [3, 2, 6, 4, 5]

Sample Output: 5

double getAverage() -> This function will return the average of all elements in the linked list.

Sample Input: [3, 2, 6, 4, 7]

Sample Output: 4.4