style(lints): count string characters directly (#74)

Author: danieleades

examples/common/mod.rs

@@ -48,7 +48,7 @@ pub fn round_trip_string<M>(model: M, input: &str)
 where
     M: Model<Symbol = char> + Clone,
 {
-    let input_bytes = input.bytes().len();
+    let input_bytes = input.len();
 
     let buffer = encode(model.clone(), input.chars());
 

examples/sherlock.rs

@@ -57,7 +57,7 @@ fn main() {
     let mut file = File::open("./resources/sherlock.txt").unwrap();
     let mut input = String::new();
     file.read_to_string(&mut input).unwrap();
-    let input_bytes = input.bytes().len();
+    let input_bytes = input.len();
 
     let model = StringModel::new(ALPHABET.chars().collect());