Cannot update / after changed folder name. (git pull)

[muwaaaah]

1. I installed a1111 using "git clone" before
2. then i changed folder name.

Problem :
I want to update a111 today, using "git pull",
But error message was shown as below.

C:\SD>git pull
fatal: not a git repository (or any of the parent directories): .git

Q1 I changed folder name, and i think i deleted some git files before in original folder. ( i am not sure delete or not )
Q2. How can i update with existing folder without any danger. C:\SD

++Ps. Can i use CMD as below?

C:\SD> git init
C:\SD> git remote add origin https://github.com/AUTOMATIC1111/stable-diffusion-webui
C:\SD> git pull

i read some internet articles about if these commands are used incorrectly,
a big problem can occur. If i use above CMD, are any files will be deleted?,