// Package etl is an Extract-Transform-Load library
package etl
import "strings"
// Transform converts an int->[]string map to string->int map
func Transform(input map[int][]string) map[string]int {
	output := map[string]int{}
	for value, letters := range input {
		for _, char := range letters {
			output[strings.ToLower(char)] = value
		}
	}
	return output
}