Matcher text java x rust

rust-match.rs

extern crate jni;

use aho_corasick::AhoCorasickBuilder;
use jni::objects::JClass;
use jni::objects::JList;
use jni::objects::JString;
use jni::sys::jint;
use jni::sys::jstring;
use jni::JNIEnv;

#[no_mangle]
#[allow(non_snake_case)]
pub extern "C" fn Java_App_match(
    _env: JNIEnv,
    _class: JClass,
    input: JString,
    keywords: JString,
) -> jstring {
    let mut matches = vec![];
    let mut result = JList::from_env(
        &_env,
        _env.new_object("java/util/ArrayList", "()V", &[]).unwrap(),
    )
    .unwrap();
    let input_text: String = _env
        .get_string(input)
        .expect("Couldn't get java string!")
        .into();
    let string_keys: String = _env
        .get_string(keywords)
        .expect("Couldn't get java string!")
        .into();
    let words: Vec<&str> = string_keys.split_whitespace().collect();
    let ac = AhoCorasickBuilder::new()
        .ascii_case_insensitive(true)
        .build(&*words);

    for mat in ac.find_iter(&input_text) {
        matches.push(vec![mat.start(), mat.end()]);
    }
    for item in matches.iter() {
        println!("{:?}", item);
        result.add(
            item
        );
    }

    let output = _env
        .new_string(format!("Hello, {}!", input_text))
        .expect("Couldn't create java string!");

    // Finally, extract the raw pointer to return.
    output.into_inner()
    // matches
}