code: func stringFormat(c *Config, widths []int, columns int) string {
  	// Create the buffer with an estimate of the length
  	buf := bytes.NewBuffer(make([]byte, 0, (6+len(c.Glue))*columns))
  
  	// Start with the prefix, if any was given. The buffer will not return an
  	// error so it does not need to be handled
  	buf.WriteString(c.Prefix)
  
  	// Create the format string from the discovered widths
  	for i := 0; i < columns && i < len(widths); i++ {
  		if i == columns-1 {
  			buf.WriteString("%s\n")
  		} else {
  			fmt.Fprintf(buf, "%%-%ds%s", widths[i], c.Glue)
  		}
  	}
  	return buf.String()
  }
docs: // stringFormat, given a set of column widths and the number of columns in
  // the current line, returns a sprintf-style format string which can be used
  // to print output aligned properly with other lines using the same widths set.