Wrong output

[MyselfYangjz]

Hello, I read your source code, and conducted a test, found that when the variable is first user input, and then defined as a string, there will still be an error detection of the vulnerability, as follows:
sub main {
my $name = $ARGV[0];
my $name = "aasa";
system ("echo Hello World! $name");
}

I checked your source code and found that it is caused by find_first only looking at the first defined variable. （AST.PL）

[MyselfYangjz]

I have made an update that can effectively deal with this situation, you can check if this way is reasonable。
AST_update.zip

[htrgouvea]

Hi @MyselfYangjz, you can push this to a repository in Github? You can make a fork of this repository

[MyselfYangjz]

I have submitted my pull request, can you review it?