That's a printf like interpolation (and % always had its special meaning in printf), where the extra spaces are padding because your pattern is "% - 206p". I'm not sure why there's a difference of 8 between that number and the number of spaces, since the interpolated value (eg: 789f78) is only 6 chars long though.

Anyway, there's no printf in your code, so I'd say either you're reading from the wrong file, or it does not contains what you think, or the code you provided is not all that you do.