first commit

functions/Cargo.lock

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

functions/Cargo.toml

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

functions/src/main.rs

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+/*
+function is a block or reusable code.
+defining the function if fn keyword, and every Rust programs starts with this main function.
+*/
+fn main() {
+    greet();
+    println!("{}", multiple(5, 5));
+}
+
+fn greet() {
+    println!("namaste!")
+}
+
+/*
+[parameterized function]
+no type given is directly compliation error, so type annotatin is important
+*/
+fn multiple(a: i32, b: i32) -> i32 {
+    a * b
+}