Get correct file names per contest.

[Enigmage]

As we know not everytime questions in Codeforces rounds are A,B,C,D,E,F sometimes they are A, B, C1,C2,D, E , A,B,C,D,E,F,G , A, B,C,D, E1, E2, F etc. So initializing a generic A,B,C,D,E,F for all contests might create some inconsistencies. We need to get the correct filenames according to the contest.

Locally I have solved this by using web scraping to extract the correct names of the questions for each contest by using the contest name provided as argument to the init command.

EDIT: I would like to make a PR for this once this is reviewed by the Mentor and other conflicting PRs are merged.