Help clap.rs multiple values and sub-command

Hello everyone,
Im developing a pet project to learn Rust, is another find clone.....

I want to be able to find files and directories in several paths, using several patterns to search for, at the same time. Then i want to be able to perform file operations over the results. This is the code snippet that configures clap.rs:

fn main() {
    let app = App::new("findx")
        .version(crate_version!())
        .author(crate_authors!())
        .about("find + directory operations utility")
        .setting(AppSettings::ArgRequiredElseHelp)
        .arg(
            Arg::with_name("paths")
                .short("p")
                .long("paths")
                .value_name("PATHS")
                .takes_value(true)
                .multiple(true)
                .help("Directories to search for the PATTERNS"),
        )
        .arg(
            Arg::with_name("patterns")
                .short("t")
                .long("patterns")
                .value_name("PATTERNS")
                .required(true)
                .takes_value(true)
                .multiple(true)
                .help("Patterns to search for"),
        )
        .subcommand(
            SubCommand::with_name("rename")
                .about("Rename the last part element of the path")
                .arg(
                    Arg::with_name("string")
                        .value_name("STRING")
                        .takes_value(true)
                        .required(true)
                        .help("Append the STRING to the end of every dir/file founded"),
                ),
        );

This is one of the execution of the program:

➜  findx git:(master) ✗ ./target/debug/findx -p ../ -t findx rename findit
paths:    ["../"]
patterns: ["findx", "rename", "findit"]
Operation:None

as you can see is taking the subcommand and the argument of the subcommand as values of -t.

this is with the -- "thing" between the main program and the subcommand

 findx git:(master) ✗ ./target/debug/findx -p ../ -t findx -- rename findit
error: The subcommand 'rename' wasn't recognized
        Did you mean 'rename'?

If you believe you received this message in error, try re-running with 'findx -- rename'

USAGE:
    findx --paths <PATHS>... --patterns <PATTERNS>...

For more information try --help

and of course that i mean rename, could someone help me with this or even at least tell me if is possible to do this with clap.rs.

Thanks in advance.