refactor: rename src folder with app

app/lib/controller.cr

@@ -0,0 +1,11 @@
+module App::Lib
+  abstract class BaseController
+     def map_changeset_errors(errors)
+      errors.reduce({} of String => Array(String)) do |memo, error|
+        memo[error[:field]] = memo[error[:field]]? || [] of String
+        memo[error[:field]] << error[:message]
+        memo
+      end
+    end
+  end
+end

app/lib/database.cr

@@ -0,0 +1,15 @@
+require "sqlite3"
+require "crecto"
+
+module App::Lib
+  class Database
+    extend Crecto::Repo
+
+    Query = Crecto::Repo::Query
+    Multi = Crecto::Repo::Multi
+
+    config do |conf|
+      conf.uri = ENV["DATABASE_URL"]
+    end
+  end
+end

app/lib/errors.cr

@@ -0,0 +1,26 @@
+require "kemal"
+
+module App
+  class BadRequestException < Kemal::Exceptions::CustomException
+    def initialize(context)
+      context.response.status_code = 400
+      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, @content = "")
+      context.response.status_code = 422
+      super(context)
+    end
+
+    getter :content
+  end
+end