public function showRegistrationForm()
{
# find session if it has an 'input'
if (session()->has('input')) {
# get the session 'input' then remove it
$input = session()->get('input');
session()->remove('input');
# set the tag 'email' to rollback the value inputted
tag()->setDefault('email', $input['email']);
}
return view('auth.showRegistrationForm');
}