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如何获取 “gen_server” 的本地名称？

可以在gen_server的状态下保存本地名称，但是我认为由于它已经存储在gen_server中，所以可以获取它。
怎么做呢？

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Erlang: 获取字符串的前n个字符

我有信用卡号码，比方说 5940043543536。出于安全目的，我只想显示前四位数字。
在erlang中如何做到这一点？

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