Impl Rust version of solution

rust_impl/Cargo.lock

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rust_impl/Cargo.toml

@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+structopt = "0.3.21"

rust_impl/src/main.rs

@@ -1,3 +1,22 @@
-fn main() {
+use structopt::StructOpt;
-    println!("Hello, world!");
+use std::collections::HashMap;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "RunLengthEncoding")]
+struct Opts {
+    input: String,
+}
+
+fn main() {
+    let opts = Opts::from_args();
+
+    let mut map: HashMap<char, u32> = HashMap::new();
+
+    for c in opts.input.chars() {
+        map.get_mut(&c).map(|v| *v += 1).or_else(|| {map.insert(c, 1); Some(())});
+    }
+
+    for (c, value) in map {
+        println!("{} with value {}", c, value);
+    }
 }