Tool to extract billing details from JSONL input and output as CSV

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.toml

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+[package]
+name = "rust-etl-code-test"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0.98"
+clap = { version = "4.5.40", features = ["derive"] }
+csv = "1.3.1"
+serdapt = "0.1.1"
+serde = { version = "1.0.219", features = ["derive"] }
+serde_json = "1.0.140"

README.md

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 # Rust ETL Code Test
 
-Fork this repo for this test. When you are done submit a PR against this repo.
+## Purpose
 
-Given the sample data provided, convert to csv in the format specified:
+This command-line tool transforms a JSONL billing report into a CSV file containing the average rate
+for each record, excluding records with an average rate greater than 30.
 
-`name, billing_code, avg_rate` where `avg_rate` is the average of all `negotiated_rate` values for each record. Exclude records with an `avg_rate` greater than 30.
+## Requirements
 
-- Feel free to use any tools or libraries of your choice.
-- The program should be as fast as possible.
-- The program should accept inputs of unbounded size.
-- The program should accept input from a file or STDIN.
-- Output should be written to a file or STDOUT.
+- Rust 1.87.0 or newer
+- Internet connection for cargo to fetch dependencies
+
+## Run
+
+```sh
+cargo run --release < sample.jsonl
+```
+
+## Run tests
+
+```sh
+cargo test
+```
+
+## Help
+
+```sh
+cargo run -- --help
+```
+
+## Notes
+
+- Every error in the input is considered fatal. This could easily be changed if that is undesirable.