Initialize Rust and VS Code.

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug executable 'cryptopals'",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--bin=cryptopals",
+                    "--package=cryptopals"
+                ],
+                "filter": {
+                    "name": "cryptopals",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug unit tests in executable 'cryptopals'",
+            "cargo": {
+                "args": [
+                    "test",
+                    "--no-run",
+                    "--bin=cryptopals",
+                    "--package=cryptopals"
+                ],
+                "filter": {
+                    "name": "cryptopals",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        }
+    ]
+}

Cargo.toml

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+[package]
+name = "cryptopals"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

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+mod set1;
+
+use crate::set1::convert_hex_to_base64;
+
+fn main() {
+    println!("Hello, world! Does it work?");
+    convert_hex_to_base64();
+}

src/set1.rs

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+pub fn convert_hex_to_base64() {
+    println!("We are here too.");
+}