03_letters/

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Lab 3 - Letter frequency

• Create an executable go program in directory 03_letters/USERNAME
• Write a function that returns a mapping of each letter to its frequency:

func letters(s string) map[rune]int

Write a function that returns a sorted slice of strings with elements "{key}:{val}". Use package sort:

func sortLetters(m map[rune]int) []string

Call fmt.Println(strings.Join(sortLetters(letters("aba")), "\n")) in main to print:

a:2
b:1

Bonus points: comprehensive tests