finally finished slice...

slice/src/main.rs

@@ -1,4 +1,4 @@
-fn first_word(s: &String) -> usize {
+fn first_word_int(s: &str) -> usize {
     let b = s.as_bytes();
     for (i, &val) in b.iter().enumerate() {
         if val == b' ' {
@@ -7,7 +7,23 @@ fn first_word(s: &String) -> usize {
     }
     s.len()
 }
-fn main() {
-    println!("{}", first_word(&String::from("sadf sdfsd fesf")));
 
+fn first_word(s: &str) -> &str {
+    let b = s.as_bytes();
+    for (i, &val) in b.iter().enumerate() {
+        if val == b' ' {
+            return &s[..i];
+        }
+    }
+    &s[..]
+}
+fn main() {
+    let test_string = "oh my gerd";
+    let string = String::from("sdf sdf esv gs ");
+    let slice = &string[0..first_word_int(&string)];
+    println!("here is the first word: _{}_", slice);
+
+    println!("here is the first word: _{}_", first_word(&string));
+    println!("here is the first word: _{}_", first_word(test_string));
+    println!("{}", test_string);
 }