decrypter.js

function decrypter(input) {
    let wordsArray = input;

    for (let word of wordsArray) {
        let newWord = '';
        for (let i = 0; i < word.length; i++) {
            let code = word.charCodeAt(i);
            code += 1;
            newWord += String.fromCharCode(code);
        }
        console.log(newWord);
    }

}

decrypter(['University', 'Potato', 'Putin', 'ABC']);