Kate想要利用Side Project多賺點錢，買喜歡的東西和回報社會。
1A2B 猜數字
過年紅包計算機
老姐要用 Kotlin 寫專案：從 Server 到 Android APP 的開發生存日記（iT邦幫忙鐵人賽系列書）
Kate wants to use Side Project to make more money, buy favorite things and give back to the society.
1A2B Bulls and cows
Red envelopes calculator of Chinese New Year