Create a project for demonstrating functions

functions/Cargo.lock

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

functions/Cargo.toml

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+[package]
+name = "functions"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

functions/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+
+    another_function();
+}
+
+fn another_function() {
+    println!("Another function.");
+}