I had some hidden string formatting in one of my classes, and now that I want to write a test for it, I pulled it out into it's own class. It's your typical "Should I create a StringUtils class?" sort of question. Should I have

class StringUtil {
    fun getInitialsFromName(name: String): String {

or just create

class InitialGeneratorService {
    fun get(name: String): String {

Or should it be a companion or just make a string extension method (seems easily abused though) I'm definitely overthinking it, but approciate any advice

Usually util function in kotlin either a top-level function (remove StringUtil class declaration and move your fun outside) or member of an

object

(use

object StringUtil {

)

in case that's a real example and not a fictional one, https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-believe-about-names/