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Directory structure:
C:\strawberry\perl\bin\test.pl
C:\strawberry\perl\subs.pm

…
sub remove_spaces {
...
return $input ;
}
…

#!C:\strawberry\perl\bin\perl.exe 
#use lib 'C:\strawberry\perl';
...
…
    $line = remove_spaces($line);
…

C:\strawberry\perl>test.pl
Undefined subroutine &main::remove_spaces called at C:\strawberry\perl
+\test.pl line 18, <INF> line 1.