A few simple changes here:

- call memset() instead of repeatedly calling strcat() on the
target string
- use shift_string_right() for CENTER (same is already used for
right RJUST)
- use memset() in shift_string_right()
- remove the (no longer needed) local buffer, which makes it
possible to call mkstring() on an arbitrarily long string

Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
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