feat(utils): add a phonetic key generator

Signed-off-by: SphericalKat <amolele@gmail.com>

lib/ketbin/pastes/utils.ex

@@ -0,0 +1,19 @@
+defmodule Ketbin.Pastes.Utils do
+  defp rand_vowel do
+    String.graphemes("aeiou")
+    |> Enum.take_random(1)
+    |> Enum.at(0)
+  end
+
+  defp rand_consonant do
+    String.graphemes("bcdfghjklmnpqrstvwxyz")
+    |> Enum.take_random(1)
+    |> Enum.at(0)
+  end
+
+  def generate_key(length \\ 10) do
+    random = Enum.random([0, 1])
+    Enum.map(0..length, fn i -> if Integer.mod(i, 2) == random, do: rand_consonant(), else: rand_vowel() end)
+    |> List.to_string
+  end
+end