finished ch3

ch3/functions/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "functions"
+version = "0.1.0"

ch3/functions/Cargo.toml

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+[package]
+name = "functions"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

ch3/functions/src/main.rs

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+fn main() {
+    another_function(10);
+    print_labeled_measurements(5, 'h');
+    another_function(five());
+}
+
+fn another_function(x: i32) {
+    println!("The value of x is {x}");
+}
+
+fn print_labeled_measurements(value: i32, unit_label: char) {
+    println!("The measurement is: {value}{unit_label}");
+}
+
+fn five() -> i32 {
+    5
+}