无论PC电脑还是手机，系统和各种应用软件都会产生不少垃圾数据，必须经常清理，其中在电脑上，Piriform出品的CCleaner无疑是最干练、最高效的清理工具，全球安装量已超1.3亿，而且已经被大名鼎鼎的安全公司Avast收购
What I am trying to do seems pretty simple, but since I am a parsec Haskell newb, the solution is eluding me.
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