The GitHub blog address looks strange

There was a GitHub blog before.
When I tried to create a new blog after deleting the repository, the blog address I was given looked differently from before.

(Deleted blog address) https://mintchoco777.github.io
(current blog address) https://mintchoco777.github.io/mintchoco777.github.io

I would appreciate it if you could tell me how to solve this.

I must have been stupid.
I checked and found that I changed my GitHub ID and the Korean alphabet was wrong.
The time I thought about it is so empty.