wro4j-core/src/main/java/ro/isdc/wro/model/resource/Resource.java
private static String cleanUri(final String uri) {
    String result = uri.trim();
    //handle empty uri
    if (!StringUtils.isEmpty(uri)) {
      final int endIndex = result.length() - 1;
      if (result.lastIndexOf('/') == endIndex) {
        result = result.substring(0, endIndex);
      }
    }
    return result;
  }
private static String cleanUri(final String uri) {
    String result = uri.trim();
    //handle empty uri
    if (!StringUtils.isEmpty(uri)) {
      final int endIndex = result.length() - 1;
      if (result.lastIndexOf('/') == endIndex) {
        result = result.substring(0, endIndex);
      }
    }
    return result;
  }
Perform a cleaning of the uri by trimming it and removing last '/' character if exists.

@param uri to clean.
@return cleaned uri.