code: public ICookie getCookie(String cookieName) {
          for (ICookie cookie : cookies) {
              if (cookie.getName().equals(cookieName)) {
                  return cookie;
              }
          }
  
          return null;
      }
docs: Returns the _first_ cookie matching <tt>cookieName</tt>. Objects returned
  by this method are of the class burp.impl.Cookie which implements the
  burp.ICookie interface.
  
  @param cookieName The name of the cookie to return
  @return The cookie, or null if there is no cookie by that name in the response.