init common library

.gitignore

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+# ---> Rust
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+.idea/

Cargo.toml

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+[package]
+name = "library-rust"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

readme.md

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+Rust Library
+================
+
+

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}