code: @SuppressWarnings("unchecked")
      @Override
      public String calculateBuildUrl(String publishedURL) {
          Iterator<JobInvocation> iterator = (Iterator<JobInvocation>) downstreamProjects();
  
          StringBuilder sb = new StringBuilder();
  
          while (iterator.hasNext()) {
              JobInvocation jobInvocation = iterator.next();
  
              sb.append("\n");
              sb.append("<a href='");
              sb.append(jobInvocation.getBuildUrl());
              sb.append("'>");
              sb.append(jobInvocation.getBuildUrl());
              sb.append("</a>");
          }
  
          return sb.toString();
      }
docs: Calculate the build URL of a build of BuildFlow type, traversing its downstream builds graph
  
  @return the build URL of a BuildFlow build, with all its downstream builds