title: Rename files in multiple subfolders
body: <p>I have multiple unique directories that each contain a file named <code>filtered_feature_bc_matrix.h5</code>. I want to paste the directory-name onto the filename to make the filename unique within each folder. Is this possible?</p>
  <pre><code>./sample_scRNA_unsorted_98433_Primary_bam/outs/filtered_feature_bc_matrix.h5
  ./sample_scRNA_unsorted_77570_Primary_bam/outs/filtered_feature_bc_matrix.h5
  </code></pre>
  <p>out:</p>
  <pre><code>./sample_scRNA_unsorted_98433_Primary_bam/outs/sample_scRNA_unsorted_98433_Primary_bam_filtered_feature_bc_matrix.h5
  ./sample_scRNA_unsorted_77570_Primary_bam/outs/sample_scRNA_unsorted_77570_Primary_bam_filtered_feature_bc_matrix.h5
  </code></pre>