mirror of
https://github.com/rjNemo/exercism-elixir
synced 2026-06-06 10:26:48 +00:00
20 lines
357 B
Elixir
20 lines
357 B
Elixir
defmodule Username do
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@spec sanitize(charlist()) :: charlist()
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def sanitize(''), do: ''
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def sanitize([ch | rest]) do
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convert(ch) ++ sanitize(rest)
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end
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defp convert(ch) do
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case ch do
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ch when ch in ?a..?z -> [ch]
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?_ -> '_'
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?ä -> 'ae'
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?ö -> 'oe'
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?ü -> 'ue'
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?ß -> 'ss'
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_ -> ''
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end
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end
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end
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