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Cargo.toml

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+[package]
+name = "rtool"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+base64 = "0.22.1"
+clap = { version = "4.5.50", features = ["derive"] }

src/main.rs

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+use base64::{Engine as _, engine::general_purpose::STANDARD};
+use clap::{Parser, Subcommand};
+
+#[derive(Parser)]
+#[command(version, about, long_about = None)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    Dec { src: String },
+    Enc { src: String },
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    match &cli.command {
+        Commands::Dec { src } => {
+            let ans = match STANDARD.decode(src) {
+                Ok(res) => res
+                    .iter()
+                    .map(|byte| format!("{:02x}", byte))
+                    .collect::<Vec<String>>()
+                    .join(" "),
+                Err(err) => err.to_string(),
+            };
+            println!("0x {}", ans);
+        }
+        Commands::Enc { src } => {
+            println!("{}", STANDARD.encode(src));
+        }
+    }
+}