codewars/go/kyu7/mumbling/k.go

package kata

import (
	"strings"
	"unicode"
)

func Accum(s string) string {
	var sl []string
	for i, r := range s {
		s = string(unicode.ToUpper(r))
		sl = append(sl, s + strings.Repeat(string(unicode.ToLower(r)), i))
	}
	return strings.Join(sl, "-")
}