Reverse a Linked List(GFG SDE Sheet Problem) in C++.

[akhilesh5056]

@Mridul-1-Sharma Kindly assign me this issue under Hacktoberfest 2022.

[Subhajit767]

I want to work on this so please assign this to me

[Mridul-1-Sharma]

I want to work on this so please assign this to me

Please contribute by creating a PR