Some random question

main.go

// Given a string, cycle the first letter of each word back one word,
// and cycle the last letter of each word forward one word.

// Example input:  "who welld horly"
// Example output: "why hello world"

// Do this example by hand:
// Input:  "bes le uoogit"
// Output: ""

package main

import (
	"fmt"
	"strings"
)

func cycleLetters(input string) string {
	stringSlice := strings.Split(input, " ")
	result := make([]string, len(stringSlice))

	for currIdx := 0; currIdx < len(stringSlice); currIdx++ {
		prevIdx := currIdx - 1
		nextIdx := currIdx + 1

		if prevIdx < 0 {
			prevIdx = len(stringSlice) - 1
		}

		if nextIdx > len(stringSlice)-1 {
			nextIdx = 0
		}

		currentWord := stringSlice[currIdx]
		firstLetterNextWord := string(stringSlice[nextIdx][0])
		lastLetterPrevWord := string(stringSlice[prevIdx][len(stringSlice[prevIdx])-1])

		result[currIdx] = firstLetterNextWord + currentWord[1:len(currentWord)-1] + lastLetterPrevWord
	}

	return strings.Join(result, " ")
}

func main() {
	fmt.Println(cycleLetters("who welld horly"))
	fmt.Println(cycleLetters("bes le uoogit"))
}