Discussion on: Daily Challenge #191 - Alphabetical Addition

[official_dulin]

Go:

import (
    "unicode/utf8"
)

func AddLetters(letters []rune) rune {
    if len(letters) == 0 {
        r, _ := utf8.DecodeRuneInString("z")
        return r
    }
    var (
        t, tt int
        base  = 96
    )
    for _, letter := range letters {
        t += int(letter) - base
    }
    if tt = t % 26; tt == 0 {
        tt = 26
    }
    return rune(tt + base)
}