You should bear in mind that in $name you only have the names of the directory entries within the directory you opened with opendir(); in order to use that entry you will need to put the the full path back, so you might have something like:

while(my $name = readdir(ODIR)) 
{ 
    
    if(-d "C:/$name") 
    { 
        print "## inside if \n";

    }
}
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/J\