Add extractor for ericasadun.com

lib/frenzy/pipeline/extractor/erica_sadun.ex

@@ -0,0 +1,27 @@
+defmodule Frenzy.Pipeline.Extractor.EricaSadun do
+  @moduledoc """
+  Extractor for https://ericasadun.com
+  """
+
+  alias Frenzy.Pipeline.Extractor
+  @behaviour Extractor
+
+  @impl Extractor
+  def extract(body) do
+    html_tree = Floki.parse(body)
+
+    case Floki.find(html_tree, ".post-content") do
+      [content_elem | _] ->
+        # content element includes social media buttons and related posts
+        content =
+          content_elem
+          |> Floki.filter_out("div.sharedaddy, div#jp-relatedposts")
+          |> Floki.raw_html()
+
+        {:ok, content}
+
+      _ ->
+        {:error, "no matching elements"}
+    end
+  end
+end