Hello and thank you for posting your query on HCM
Height is a hereditary parameter. How much height a person will gain is encoded by the genes.
Height increase stops once a person attains puberty
because after this time the growing ends of the long bones close.
You have mentioned that you want to know about exercises which will straightain the spine.
I would suggest you to maintain a good posture (spine should be atraight while walking and sitting), try back stretches especially if your job demands long sitting hours and other exercises which streangthen the back muscles.
You can visit a physiotherapist and get the demonstration of the exercises also.
I hope my answer is of help to you.