Need the logic for the below requirement
On a form there is a 'Re-Notify' button
When the user clicks on it, a mail notification is shot. This
'Re-Notify' button can be used any number of times. The aim here is, the 'Re-Notify' is used after a first notification is sent and there is no response from the user. So, when the 'Re-Notify' button is clicked for the first time, the subject line should contain the count as '2nd Notification', and for the secont time when the 'Re-Notify' button is clicked the subject line should contain '3rd Notification' and so on.