Şuarada son mesajda nokta ve virgül ayrımınıda yaparak kodu eklemişler zaten.
Muhtemelen sizin koduda ilk mesajdan:

const result = document.getElementById('result');
let str = "I am not gonna live forever, but I wanna live while I am alive.";
// strip all punctuation from string
let strStripped = str.replace(/[,.!]/g, ''); result.innerHTML = `strStripped: "${strStripped}"\n`;
// separate string into array of lowercase words
let words = strStripped.toLowerCase().split(' '); result.innerHTML += 'words: ' + JSON.stringify(words, null, 2);
// form object of word counts
let wordCounts = {}; words.forEach(word => {  wordCounts[word] = (wordCounts[word] || 0) + 1; }); result.innerHTML += '\nwordCounts: ' +  JSON.stringify(wordCounts, null, 2);