code: protected void fill(Appendable appendable, char filler, int count) throws IOException {
  
      for (int i = 0; i < count; i++) {
        appendable.append(filler);
      }
    }
docs: This method fills the {@link Appendable} with the given {@code count} of {@code filler} characters.
  
  @param appendable is the {@link Appendable} to fill.
  @param filler is the {@link TextColumnInfo#getFiller() fill-character}.
  @param count is the number of fill-characters ({@code filler}) to add.
  @throws IOException if caused by the {@link Appendable}.