Email Verification code system

[eluser]shahnawazahmed[/eluser]
Hello developers ,

currently , i am working on the hospital management system , i have developed the register and login system and i want to improve its functionality by developing the Email verification system , if new member registers to the system it will send the verification link containing unique code .
if it is available on the internet please share me the link or if any of my brother developed please share the code if you have no problem to share it make sure it is developed in CI .

regards and bundle of thanks in advance
shahnawaz