sillon-fictionnel/themes/writeonly/layouts/partials/shared/post-isbn.html

<div class="text-center text-muted mb-1">
  {{ with .Params.ISBN }}
    <span class="d-inline-flex align-items-center small mx-2">
      <i class="fa-solid fa-book"></i>
      <a href="https://search.worldcat.org/search?q={{ . }}&offset=1"> ISBN {{ . }}</a>
    </span>
  {{ end }}
  {{ with .Params.ISBNS }}
    <span class="d-inline-flex align-items-center small mx-2">
            {{ range . }}
                <i class="fa-solid fa-book"></i>
                <a href="https://search.worldcat.org/search?q={{ . }}&offset=1"> ISBN {{ . }}  &#8200;</a>
            {{ end }}
    </span>
  {{ end }}
</div>