Find words that have the same letters in a list

rotate_and_match.go

package main

import (
	"fmt"
	"strings"
)

func rotate(a []byte, i int) {
	for count := 1; count <= i; count++ {
		tmp := a[0]
		for n := 1; n < len(a); n++ {
			a[n-1] = a[n]
		}
		a[len(a)-1] = tmp
	}
}

func main() {
	output := make([][]string, 0)
	
	var input = []string{"Tokyo", "London", "Rome", "Donlon", "Kyoto", "Paris"}
	for i := 0; i < len(input); i++ {
		for j := i + 1; j < len(input); j++ {
			if len(input[i]) != len(input[j]) {
				continue
			}
			old := []byte(input[j])
			for x := 0; x < len(input[j]); x++ {
				rotate(old, 1)
				if strings.ToLower(input[i]) == strings.ToLower(string(old)) {
					fmt.Printf("%s == %s\n", input[i], input[j])
					output = append(output, []string{input[i], input[j]})
					continue
				}
			}	
		}
	}
	fmt.Println(output)

}