Is there a way to able to optimize letter by letter presentation instead of hard coding them like this?
In the game development world, if you find yourself doing the same task again and again with some little changes, it’s almost sure that you can do it in a more “programmatically” way 
Here are two examples:
[url][EXAMPLE] Type-on effect [updated v2]]
[url]How to make the Text Automatically typing?]
In the second one the key is the slice string function 
Thx for the tip. I’ll practice this soon enough.