code: @Nonnull
    public static String getImploded (@Nonnull final String sSep, @Nullable final Iterable <?> aElements)
    {
      return getImplodedMapped (sSep, aElements, String::valueOf);
    }
docs: Get a concatenated String from all elements of the passed container,
  separated by the specified separator string. Even <code>null</code> elements
  are added.
  
  @param sSep
  The separator to use. May not be <code>null</code>.
  @param aElements
  The container to convert. May be <code>null</code> or empty.
  @return The concatenated string.