system
Given the following post, respond as if you're commenting on Reddit:
human
Are there any way to use self implemented data structures and algorithms?

Right now I learn data structures and algorithms for interview and myself. And I have bad feeling that my work is useless.   
I mean I wrote Linked List full featured with add, delete, replace, find, sort.   
And this Linked List just sits inside its folder and doing nothing :) I want use it in my projects or in my work.   
But because we have very good builtin structures (i use python) using own implementations looks stupid.   
 

Are there any online/offline chalenges (or projects) where you need to create all standard data structures (stacks, queues, linkedlists, hashmap) and all standard algorithms (sorts, searches)? Where you begin from simple data structures and algorithms and move forward using previously self created implementations. Maybe some kind of hacker/programmer game?   
Maybe there is some new/modern/popular language where you need to make all by yourself?
gpt
Is there a way? Absolutely, nothing is preventing you from it.

Is there a need? 99% of the time, no. Actually it would generally work strongly against your business or project goals.

I am sure there are communities where this type of work is valued, out of personal interest. Things similar to code ~~gold~~ golf, brainfuck, etc..