[LIB] Add new linked list functions to libft

[itislu]

• ft_lstadd_back_eff() ft_lstadd_back_tail()
• ft_lstnew_back_eff() ft_lstnew_back_tail()
• ft_lstdup()
• ft_lstsize_d()

The efficient versions of ft_lstadd_back expect a tail pointer of the list to avoid traversing the whole list.
I made those function in an older, unmerged branch in February already.

[LeaYeh]

I think *_eff is really confused, why not just replace the logic?

[itislu]

Because it requires a tail pointer as a third argument.
The caller has to provide that, which would require to add that parameter to all calls of ft_lstadd_back() and ft_lstnew_back().

[LeaYeh]

I see the interface change, but i will suggest you to use efficient but not the brief

[itislu]

I renamed the functions:

• ft_lstadd_back_eff() -> ft_lstadd_back_tail()
• ft_lstnew_back_eff() -> ft_lstnew_back_tail()

[Copilot]

Pull Request Overview

This PR introduces new tail-pointer optimized functions for singly linked lists and adds a doubly linked list sizing function to improve performance and functionality in libft.

• Introduces ft_lstadd_back_tail() and ft_lstnew_back_tail() to avoid list traversal when appending nodes.
• Adds ft_lstdup() for duplicating singly linked lists and ft_lstsize_d() for computing the size of doubly linked lists.
• Updates header files and build scripts to integrate these new functions.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
libraries/libft/src/lists/singly_linked/ft_lstnew_front.c	Added NULL check for lst and updated function documentation.
libraries/libft/src/lists/singly_linked/ft_lstnew_back_tail.c	Added new tail-pointer based node creation function.
libraries/libft/src/lists/singly_linked/ft_lstnew_back.c	Added NULL check for lst and updated documentation accordingly.
libraries/libft/src/lists/singly_linked/ft_lstmap.c	Updated to use the new ft_lstadd_back_tail() for tail-based appending.
libraries/libft/src/lists/singly_linked/ft_lstdup.c	Added new function to duplicate a list using tail-pointer methods.
libraries/libft/src/lists/singly_linked/ft_lstadd_back_tail.c	Introduced new function to add a node with tail pointer updates.
libraries/libft/src/lists/doubly_linked/ft_lstsize_d.c	Introduced new function to compute the size of a doubly linked list.
libraries/libft/inc/libft.h	Updated header with prototypes for new functions.
libraries/libft/build/libft.mk	Updated build file to include new source files.