Rename the controller and the view names to "Link".

lib/link_shortener_web/controllers/api/v1/link_controller.ex

@@ -1,4 +1,4 @@
-defmodule LinkShortenerWeb.Api.V1.LinksController do
+defmodule LinkShortenerWeb.Api.V1.LinkController do
   use LinkShortenerWeb, :controller
 
   alias LinkShortener.Links

lib/link_shortener_web/router.ex

@@ -26,7 +26,7 @@ defmodule LinkShortenerWeb.Router do
     pipe_through :api
 
     scope "/v1", Api.V1, as: :v1 do
-      resources "/links", LinksController
+      resources "/links", LinkController
     end
   end
 

lib/link_shortener_web/views/api/v1/link_view.ex

@@ -1,13 +1,13 @@
-defmodule LinkShortenerWeb.Api.V1.LinksView do
+defmodule LinkShortenerWeb.Api.V1.LinkView do
   use LinkShortenerWeb, :view
-  alias LinkShortenerWeb.Api.V1.LinksView
+  alias LinkShortenerWeb.Api.V1.LinkView
 
   def render("index.json", %{links: links}) do
-    %{data: render_many(links, LinksView, "link.json")}
+    %{data: render_many(links, LinkView, "link.json")}
   end
 
   def render("show.json", %{links: link}) do
-    %{data: render_one(link, LinksView, "link.json")}
+    %{data: render_one(link, LinkView, "link.json")}
   end
 
   def render("link.json", %{links: link}) do