<% if user_signed_in? %>
  <li><%= link_to 'Edit account', edit_user_registration_path %></li>
  <li><%= link_to 'Sign out', destroy_user_session_path, :method=>'delete' %></li>
<% else %>
  <li><%= link_to 'Sign in', new_user_session_path %></li>
  <li><%= link_to 'Sign up', new_user_registration_path %></li>
<% end %>
<% if user_signed_in? %>
  <li><%= link_to 'Users', users_path %></li>
<% end %>
  <li><%= link_to 'All Students', students_path %></li>

<% if user_signed_in? %>
  <li><%= link_to 'Edit account', edit_user_registration_path %></li>
  <li><%= link_to 'Sign out', destroy_user_session_path, :method=>'delete' %></li>
<% else %>
  <li><%= link_to 'Sign in', new_user_session_path %></li>
  <li><%= link_to 'Sign up', new_user_registration_path %></li>
<% end %>
<% if user_signed_in? && !current_user.is_volunteer? %>
  <li><%= link_to 'Users', users_path %></li>
<% end %>
  <li><%= link_to 'All Students', students_path %></li>

Remove Users Link From Navigation If Volunteer
Remove Users Link From Navigation If Volunteer
