Make encode more flexible

By using `impl AsRef<[u8]>` instead of raw `&[u8]` encode may be used
with Strings and string slices directly. This is also important for
foreign types as they can implement `AsRef<[u8]>` and be directly
usable by `encode`.

Signed-off-by: Wiktor Kwapisiewicz <wiktor@metacode.biz>

src/lib.rs

@@ -28,7 +28,8 @@ impl fmt::Display for DecodeError {
     }
 }
 
-pub fn encode(input: &[u8]) -> String {
+pub fn encode(input: impl AsRef<[u8]>) -> String {
+    let input = input.as_ref();
     let mut result = Vec::new();
     let chunks = input.chunks(5);
 
@@ -92,6 +93,17 @@ mod tests {
         assert_eq!(encode(b"asdasd"), "cf3seamuco".to_string());
     }
 
+    #[test]
+    fn encode_str() {
+        assert_eq!(encode("asdasd"), "cf3seamuco".to_string());
+    }
+
+    #[test]
+    fn encode_string() {
+        let string = String::from("asdasd");
+        assert_eq!(encode(string), "cf3seamuco".to_string());
+    }
+
     #[test]
     fn simple_decode() {
         assert_eq!(decode("cf3seamu"), Ok(b"asdas".to_vec()))