feat: delete link

app/lib/errors.cr

@@ -2,17 +2,24 @@ require "kemal"
 
 module App
   class BadRequestException < Kemal::Exceptions::CustomException
-    def initialize(context, message = Hash(String, String))
+    def initialize(context, message : String)
       context.response.status_code = 400
       context.response.print({ "error" => message }.to_json)
       super(context)
     end
   end
 
+  class NotFoundException < Kemal::Exceptions::CustomException
+    def initialize(context)
+      context.response.status_code = 404
+      super(context)
+    end
+  end
+
   class UnprocessableEntityException < Kemal::Exceptions::CustomException
-    def initialize(context, message = Hash(String, String))
+    def initialize(context, message : Hash(String, Array(String)))
       context.response.status_code = 422
-      context.response.print({ "error" => message }.to_json)
+      context.response.print({ "errors" => message }.to_json)
       super(context)
     end
   end