Refactor birthday script

[divijbindlish]

Please do it as soon as possible. The code literally hurts the eyes.

[abhshkdz]

Oh man. 😮

[captn3m0]

This was my version, for comparison

[aryanraj]

Also add a notification module that checks for birthday everyday and posts on slack.
Use slack-attachment for this.

[akashdeepgoel]

done. please check

[aryanraj]

Why so many gobal variables?