title: How to pass optional parameter in Specflow in C#
body: <p>I have the below steps in feature file</p>
  
  <pre><code>When I add employee with vendor 'vendorname'
  And I add employee with vendor 'vendorname' and client 'clientname'
  </code></pre>
  
  <p>I want these two steps in a single step definition where client name can be optional.
  I can able to achieve this using two step definition but it will duplicate the code.</p>