fix(iban): format iban after validation

app/models/champs/iban_champ.rb

@@ -20,5 +20,20 @@
 #  type_de_champ_id               :integer
 #
 class Champs::IbanChamp < Champ
-  validates_with IbanValidator
+  validates_with IbanValidator, if: -> { validation_context != :brouillon }
+  after_validation :format_iban
+
+  def for_api
+    to_s.gsub(/\s+/, '')
+  end
+
+  def for_api_v2
+    for_api
+  end
+
+  private
+
+  def format_iban
+    self.value = value&.gsub(/\s+/, '')&.gsub(/(.{4})/, '\0 ')
+  end
 end