Automation/workflow to send birthday greetings employee to employee

Automation/workflow to send birthday greetings employee to employee

Hello. 

I was trying to make it automatic that when an employee's birthday is coming up, emails will be sent to other employees to write in their greetings and then it will be sent to the celebrant to the day of his birthday.

Also how can i create a contact list that excludes the celebrant of an upcoming birthday?