Shell Programming and Scripting

Dear All,
I was trying like below to get rid off the space in front of the line(see the previous post).
It will be very nice if anybody can correct this code below.

Code:

#!/usr/bin/perl -w

$#ARGV==0 or die "Usage: 2ndprocess-megan-script 1st-output-file-as-inputfile\n";

$i=1;
while (<>){
chomp;
   
 if (/Taxonomy:/ ) { 
     $x = $1; $x =~ s/^\s+|\s+$//g; ##for this line there is the error
     open(OUT,">>","output_".$i++) or die "Cannot open for writing:$!\n";
     $f=1; next;
 }
 
 if (/\+*End of summary for file/ ){
    $f=0;close(OUT);next;
 }
 if ($f) { print OUT $_."\n";}
}

But its not working.

Can anybody please help me to have the out put in the form:
Gammaproteobacteria: 2767
Alphaproteobacteria: 4123
Deltaproteobacteria: 1343
Epsilonproteobacteria: 26
Betaproteobacteria: 397
unclassified Proteobacteria: 48
Elusimicrobium: 2
candidate division WWE1: 9
Flavobacteria: 2358
Sphingobacteria: 136
Bacteroidia: 162
environmental samples: 21
Chlorobia: 77
Planctomycetacia: 40
Spirochaetes (class): 15
Nitrospira (class): 1
Bacilli: 25
Not assigned: 1445
No hits: 220253

Thanks a lot.
Best,