add 4.3

3 files changed, 32 insertions, 0 deletions

diff --git a/4.3/Cargo.lock b/4.3/Cargo.lock
new file mode 100644
index 0000000..a196e73
--- /dev/null
+++ b/4.3/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "first_word"
+version = "0.1.0"
diff --git a/4.3/Cargo.toml b/4.3/Cargo.toml
new file mode 100644
index 0000000..eaed807
--- /dev/null
+++ b/4.3/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "first_word"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/4.3/src/main.rs b/4.3/src/main.rs
new file mode 100644
index 0000000..4fca802
--- /dev/null
+++ b/4.3/src/main.rs
@@ -0,0 +1,19 @@
+fn main() {
+    let mut s = String::from("hello world");
+    let word = first_word(&s);
+    s.clear();
+
+    println!("word: {} in {}", word, s);
+}
+
+fn first_word(s: &String) -> usize {
+    let bytes = s.as_bytes();
+
+    for (i, &item) in bytes.iter().enumerate() {
+        if item == b' ' {
+            return i;
+        }
+    }
+
+    return s.len();
+}