Implementing Doubly Linked List in C

# Introduction

In this challenge, we will be fixing the bugs in an implementation of a doubly linked list. The doubly linked list is a type of linked list in which each node contains pointers to both the previous and the next nodes. Our objective is to fix the bugs in the code so that the basic operations of the doubly linked list can be executed correctly without any memory leaks. To complete this challenge, the modified source file needs to be stored in a specific location. The knowledge points required for this challenge include understanding doubly linked list data structure, pointers, and function pointers.