https://hellohasan.com/2016/10/14/%e0%a6%b2%e0%a6%bf%e0%a6%a8%e0%a6%bf%e0%a7%9f%e0%a6%be%e0%a6%b0-%e0%a6%b8%e0%a6%be%e0%a6%b0%e0%a7%8d%e0%a6%9a-linear-search-algorithm/