gistfile1.txt

use std::env;

fn main() {
    let mut tomlfile = "";

    for argument in env::args() {
        let tmp = &*argument;
        if tmp.contains("toml=") {   
            println!("{}", &tmp[5 .. tmp.len()]);
            tomlfile = &tmp[5 .. tmp.len()];
        }
    }

    println!("{}", tomlfile);
}

new code:

use std::env;

fn main() {
    let mut tomlfile = String::new();

    for argument in env::args() {
        let tmp = &*argument;
        if tmp.contains("toml=") {
            tomlfile = (&tmp[5 .. tmp.len()]).to_string();
        }
    }

    println!("{}", tomlfile);
}