Create parent-children structure for the clones

[abdullahemad12]

Task

Create a parent-children structure, so that whenever a cranbtree is cloned, its clone is attached to it. As a consquence, whenever a parent is to be deleted, all it's children will be deleted as well and their roots is set to NULL.

Design

1. Add a parent field to the struct cranbtree that will be set to the parent if the tree is a clone. Set to NULL if the tree is not a clone.
2. Add a list of clones to struct cranbtree that will contain a list of pointers to the clones of the parent.

Algorithm

Whenever a clone is created:

1. set the parent field of the clone to the parent that it was cloned from
2. Add a pointer to the clone to the list of children of the parent.

Whenever the clone is deleted:

1. Go to the parent before the deletion and remove the pointer of this clone from the list
   note: remember destroy_objects function does not get applied to objects stored in a clone

Whenever a parent is deleted:

1. set the root pointer of the children to NULL
2. Destroy the children
3. Destroy the parent

[bovem]

I would like to be assigned this, if this is still unresolved.