public/subjects/cameltosnakecase

Camel-to-snake-case

Instructions

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

Camel case is the practice of writing phrases without spaces or punctuation, it indicates the separation of two words with a single capitalized letter. Snake case is a style of writing in which each space is replaced by an underscore (_) character.

Here are some rules for you to follow:

• 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.

Basic CamelCase Capitalization Rules:

• The first letter must be capitalized.
• The word must not have two capitalized letters together (CamelCAse) nor end with a capitalized letter (CamelCasE).
• No numbers or punctuations are allowed in the word at any place (CamelCase1more).

Expected function

func CamelToSnakeCase(s string) string{
    //Your code here
}

Usage

Here is a possible program to test your function:

package main

import "fmt"

func main() {
    fmt.Println(CamelToSnakeCase("HelloWorld")) 
    fmt.Println(CamelToSnakeCase("helloWorld"))
    fmt.Println(CamelToSnakeCase("CamelToSnakeCase"))
    fmt.Println(CamelToSnakeCase("132322"))
}

and the output should be:

$ go run .
Hello_World
helloWorld
Camel_To_Snake_Case
132322