Add withdrawable_title helper method

app/helpers/title_helper.rb

@@ -0,0 +1,5 @@
+module TitleHelper
+  def withdrawable_title(content_item)
+    content_item.withdrawn? ? "[Withdrawn] #{content_item.title}" : content_item.title
+  end
+end

spec/helpers/title_helper_spec.rb

@@ -0,0 +1,17 @@
+RSpec.describe TitleHelper do
+  include described_class
+
+  describe "#withdrawable_title" do
+    it "returns a non-withdrawn title unchanged" do
+      content_item = instance_double(FatalityNotice, title: "My Title", withdrawn?: false)
+
+      expect(withdrawable_title(content_item)).to eq("My Title")
+    end
+
+    it "returns a withdrawn title prefixed with the text [Withdrawn]" do
+      content_item = instance_double(FatalityNotice, title: "My Title", withdrawn?: true)
+
+      expect(withdrawable_title(content_item)).to eq("[Withdrawn] My Title")
+    end
+  end
+end