Format the balance of user

app/helpers/application_helper.rb

@@ -1,2 +1,13 @@
 module ApplicationHelper
+  def euro f
+    number_to_currency f, unit: '€'
+  end
+
+  def euro_from_cents(f)
+    if f
+      euro (f / 100.0)
+    else
+      nil
+    end
+  end
 end

app/views/users/show.html.haml

@@ -1,4 +1,6 @@
-%h2= "#{@user.name} (balance: #{@user.balance/100.0})"
+%h2
+  = @user.name
+  %small= "balance: #{euro_from_cents @user.balance}"
 
 = render 'transactions/new'