Data update

Task/Fibonacci-sequence/Rust/fibonacci-sequence-2.rs

@@ -0,0 +1,12 @@
+use std::mem;
+fn main() {
+    fibonacci(0,1);
+}
+
+fn fibonacci(mut prev: usize, mut curr: usize) {
+    mem::swap(&mut prev, &mut curr);
+    if let Some(n) = curr.checked_add(prev) {
+        println!("{}", n);
+        fibonacci(prev, n);
+    }
+}