use strict;
use warnings;
use File::Basename;

while (my $line = <DATA>) {
    if ($line =~ /#include [<"](\S+\.h)[>"]/)
    {
        print basename($1), "\n";
    }
}
__DATA__
#include "string.h" --> below code prints header
#include <stdlib.h> --> below code prints header
#include <sys/dispatch.h> --> not able to get the header name(dispatch.h)