解法：
1.假定單詞數為0
2.走訪sentences，透過切割空白取得陣列長度
3.判斷當前長度是否大於單詞數，如果是則指派給單詞數
4.回傳單詞數
JavaScript
/**
* @param {string[]} sentences
* @return {number}
*/
var mostWordsFound = function (sentences) {
let count = 0;
sentences.forEach(s => {
let sum = s.split(" ").length;
count = count > sum ? count : sum;
});
return count;
};