chore(build): init Cargo package

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "mini-avl"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "mini-avl"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

src/main.rs

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+fn main() {}