Commit 52639a5

@@ -1,19 +1,22 @@
 fn main() {
-    let mut s = String::from("hello world");
+    let s = String::from("hello world");
     let word = first_word(&s);
-    s.clear();
 
-    println!("word: {} in {}", word, s);
+    // let hello = &s[0..5];
+    // let world = &s[6..11];
+
+    // s.clear();
+    println!("word: {word} in {s}");
 }
 
-fn first_word(s: &String) -> usize {
+fn first_word(s: &str) -> &str {
     let bytes = s.as_bytes();
 
     for (i, &item) in bytes.iter().enumerate() {
         if item == b' ' {
-            return i;
+            return &s[0..i];
         }
     }
 
-    return s.len();
+    return &s[..];
 }