code: func (r *Render) getTemplateName(tpl string) string {
  	dir, file := filepath.Split(tpl)
  	dir = strings.Replace(dir, r.TemplatesDir, "", 1)
  	file = strings.TrimSuffix(file, r.Ext)
  	return dir + file
  }
docs: // getTemplateName returns the name of the template
  // For example, if the template path is `templates/articles/list.html`
  // getTemplateName would return `articles/list`