"please help me this time(by writing correct code) because today is last date of my code submission for college project"

Don't bother cheating, review the existing responses, fix it yourself.

  #!/usr/bin/perl
use warnings;
use strict;

my $file1 = 'C:/Users/Siddharth/Desktop/our.txt';
 my $file2 = 'C:/Users/Siddharth/Desktop/my.txt';
my $search_file = "";
open(my $fh2, "<$file2");

while(my $line = <$fh2>)
{
   $search_file .= $line;
}

open(my $fh1, "<$file1");

while(my $line = <$fh1>)
{
   chomp($line);

   if($line =~ m/\w+\s+(.*)/)
   {
       my $search_string = quotemeta("$1");

       if($search_file =~ m/(.*$search_string.*)/)
       {
          
       }
       else
       {
          print " $line\n";
       }
   }
   else
   {
      print "Invalid line: $line\n";
   }
}
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