Done

app/application.rb

@@ -0,0 +1,27 @@
+class Application 
+
+    @@items = []
+
+    def call(env)
+        resp = Rack::Response.new
+        req = Rack::Request.new(env)
+
+        if req.path.match(/items/)
+            item_name = req.path.split("/items/").last
+            item = @@items.find{|i| i.name == item_name}
+
+            if item.nil?
+                resp.write "Item not found"
+                resp.status = 400
+            else
+                resp.write item.price
+            end
+        else
+            resp.write "Route not found"
+            resp.status = 404
+        end
+
+        resp.finish
+    end
+
+end