Adding more data structures in C language

[Aarav-Nigam]

I want to add more data structures in C language like (Red Black Tree, AVL tree)
Can you please assign this issue to me so I can work on this Issue?
Thank You.

[Aarav-Nigam]

#524
I have also created a pull request here
#524
Please merge it with the main branch.

[saku1331]

I wish to contribute. Kindly assign me to this.