1.every value should end with '/'
2. should be enclosed within quotes ""
3. Should have comma ',' at end

See the concatenation operator '.' in perlop, Additive Operators, and substr.

Read perlop. All of it.

I want to maintain the same exisitng format in @exclpaths array

The format in your @exclpaths is its representation in code. Inside the array, the strings are not enclosed within double quotes, and they don't have a comma at the end:

my @exclpaths = (
    "wefwfewf/fewfff/",
    "btrtbrtb/gbrgbrg/rttty/",
 );
print $_,"\n" for @exclpaths;
__END__
wefwfewf/fewfff/
btrtbrtb/gbrgbrg/rttty/
[download]

If you want decorations, just add them:

my @exclpaths = (
    "wefwfewf/fewfff/",
    "btrtbrtb/gbrgbrg/rttty/",
 );
print "\"$_\",\n" for @exclpaths;
__END__
"wefwfewf/fewfff/",
"btrtbrtb/gbrgbrg/rttty/",
[download]