Add code

example_3/.gitignore

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+/target

example_3/Cargo.toml

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+[package]
+name = "example_3"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+rayon = "1.10.0"

example_3/src/main.rs

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+use rayon::iter::{IntoParallelIterator, IntoParallelRefIterator, ParallelIterator};
+use std::fs::read_to_string;
+
+fn main() {
+    // read a csv file to a string
+    let my_string = read_to_string("my_file.txt").unwrap();
+
+    let my_vec = my_string.lines().collect::<Vec<&str>>();
+    let my_vec: Vec<String> = my_vec
+        //.into_iter()
+        .into_par_iter()
+        .filter(|x| x.contains("ERROR"))
+        .map(|x| x.to_owned())
+        .collect();
+
+    // this should now print a vec of vecs
+    // where every single value is the "Hello world!" string
+    println!("{:?}", my_vec);
+}