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prefix_print("A\nB");
prefix_print("C\n");

use strict;
use warnings;
...
prefix_print("A\nB","C\n");
prefix_print("A\nB");
prefix_print("C\n");

PA
PBC
PA
PBC

use strict;
use warnings;
...
prefix_print('');
prefix_print();
prefix_print("the end\n");

PyA
PBC
...
PABC
P
Pthe end