Index of a string lowercase calculation/attribution

Getting Help
1

Hi,

I would like to set the value of new_string -2 characters then he is currently on the lowercase a-z charset, I do have this piece of code until now:

https://play.golang.org/p/iAv8tXpAG9

edit the link the code was wrong.

2

DONE: https://play.golang.org/p/GDpyRiOlfY

3

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