Ensure Question.js

/*Given a string, write a function that returns the string with a question mark ("?") appends to the end, unless the original string ends with a question mark, in which case, returns the original string.

For example (Input --> Output)

"Yes" --> "Yes?"
"No?" --> "No?"*/

function ensureQuestion(s) {
    return s.endsWith('?') ? s: s + '?'
}

function ensureQuestion(s) {
    return s.split('?').join('').concat('?')
}