How is it working?

Question

https://www.sololearn.com/learn/CSharp/2584/
I didn't understand part with "formated lines"

Answer 1

Black Viking go through this link :
https://www.c-sharpcorner.com/UploadFile/mahesh/format-string-in-C-Sharp/

Here is the simplified code :
https://code.sololearn.com/cS24nql0x6g2/?ref=app