public/subjects/cameltosnakecase

cameltosnakecase

Instructions

Write a function that converts a string from camelCase to snake_case.

• If the string is empty, return an empty string.
• If the string is not camelCase, return the string unchanged.
• If the string is camelCase, return the snake_case version of the string.

For this exercise you need to know that camelCase has two different writing alternatives that will be accepted:

• lowerCamelCase
• UpperCamelCase

Rules for writing in camelCase:

• The word does not end on a capitalized letter (CamelCasE).
• No two capitalized letters shall follow directly each other (CamelCAse).
• Numbers or punctuation are not allowed in the word anywhere (camelCase1).

Expected function

func CamelToSnakeCase(s string) string{

}

Usage

Here is a possible program to test your function:

package main

import (
	"fmt"

	"piscine"
)

func main() {
	fmt.Println(piscine.CamelToSnakeCase("HelloWorld"))
	fmt.Println(piscine.CamelToSnakeCase("helloWorld"))
	fmt.Println(piscine.CamelToSnakeCase("camelCase"))
	fmt.Println(piscine.CamelToSnakeCase("CAMELtoSnackCASE"))
	fmt.Println(piscine.CamelToSnakeCase("camelToSnakeCase"))
	fmt.Println(piscine.CamelToSnakeCase("hey2"))
}

And its output:

$ go run .
Hello_World
hello_World
camel_Case
CAMELtoSnackCASE
camel_To_Snake_Case
hey2