Challenge: Inserting Elements in a Linked List

Introduction

To practice working with linked lists, you’ll have to implement the following functions:

• listLength, which returns the number of elements inside a linked list.
• insertAtPos, which inserts an element at a specified position inside a list.

The listLength function

Problem statement

Write a function listLength, which takes a list as input and returns the number of elements inside the list.

For example:

• For the list [1, 2, 3, 4, 5], return 5, which is the number of elements.
• For the empty list [], return

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