each user having category with their name and can add sub categories post in that category

thank you guys

I went thru many forums and other details of the post where i came to conclution to create a simple plugin and will work as below
the algo is divided in different sections

signup

when user x is getting registered there will be a category that is created in the name as x1234 this is the user name and reg. numbers and all the data and sub categories of user x will be dumped in here.

login section:

when user is logged in he will not be given any rights of wordpress instead a custom rights are created for each user.
so that they can only see their post to edit

edit section

when user creates the blog in the edit section he actually creates category under his Category wiz. x1234 this category has to have atleast one post. url for the blog will be mysite.com/x1234/cat_name/post_name

all users are restricted to modify post or blogs of antother users they can just comment on it

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