chore: mv smartstring

smartstring/src/main.rs

@@ -0,0 +1,11 @@
+use smartstring::{Compact, SmartString};
+use std::mem::size_of_val;
+
+fn main() {
+    let smart = SmartString::<Compact>::from("hello world");
+    dbg!(size_of_val(&smart));
+
+    let stand = String::from("hello world");
+    dbg!(size_of_val(&stand));
+    dbg!(size_of_val(&stand) + stand.capacity());
+}