Ruby Ruby 的 module 经常用来做 mixin，如何能隔离其中的一些方法令其为私有？
一个 method 过长我们通常需要拆分成一些小 method，而这些小 method 是不希望暴露给外界的，这时有办法隔离他们吗？
module Foo
def bar
bar_sub_1
bar_sub_2
end
def bar_sub_1
end
def bar_sub_2
end
end
module Foo
def bar
bar_sub_1
bar_sub_2
end
private # 加上这行！
def bar_sub_1
end
def bar_sub_2
end
end
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