Set up cargo workspace and shared crate

.gitignore

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+# Rust
+/target/

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "tta"
+version = "0.0.0"

Cargo.toml

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+[workspace]
+resolver = "2"
+members = ["tta"]
+
+[workspace.package]
+version = "0.0.0"
+edition = "2021"
+
+[workspace.dependencies]
+
+[workspace.lints]
+rust.unsafe_code = { level = "forbid", priority = 1 }
+# Lint groups
+rust.deprecated_safe = "warn"
+rust.future_incompatible = "warn"
+rust.keyword_idents = "warn"
+rust.rust_2018_idioms = "warn"
+rust.unused = "warn"
+# Individual lints
+rust.let_underscore_drop = "warn"
+rust.non_local_definitions = "warn"
+rust.redundant_imports = "warn"
+rust.redundant_lifetimes = "warn"
+rust.single_use_lifetimes = "warn"
+rust.unit_bindings = "warn"
+rust.unused_crate_dependencies = "warn"
+rust.unused_import_braces = "warn"
+rust.unused_lifetimes = "warn"
+rust.unused_qualifications = "warn"
+# Clippy
+clippy.use_self = "warn"

tta/Cargo.toml

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+[package]
+name = "tta"
+version = { workspace = true }
+edition = { workspace = true }
+
+[dependencies]
+
+[lints]
+workspace = true

tta/src/lib.rs

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+pub fn greet(name: &str) -> String {
+    format!("Hello {name}!")
+}