Fix a warning in Elixir 1.16 #2
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In Elixir 1.16 calls like `String.slice(key, 1..-1)` produce warnings: ``` warning: negative steps are not supported in String.slice/2, pass 1..-1//1 instead ``` `1..-1//1` option is not suitable for people on Elixir < 1.12, so here I use `String.slice/3`.
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In Elixir 1.16 calls like
String.slice(key, 1..-1)produce warnings:1..-1//1option is not suitable for people on Elixir < 1.12, so here I useString.slice/3.