Here's a substitution option:
use strict;
use warnings;
use File::Slurp qw/read_file write_file/;
write_file 'rij1.txt', map s/^(\S+) (\S+ )/"$1 $2" . ' ' x 39/er,
read_file 'rij1.txt';
Have assumed the second field isn't empty, as it seems that the OP's suggesting it's currently fixed at 11 non-space characters to which 39 spaces are to be added.
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
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or How to display code and escape characters
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