chore: split example into lib and script

examples/sample/lib/syntax.ak

@@ -1,17 +1,10 @@
-use aiken/context.{ScriptContext}
+use aiken/builtins.{appendByteString}
 
-pub type Datum {
-  something: String,
+pub type Bool {
+  True
+  False
 }
 
-pub type Redeemer {
-  Buy
-  Sell
-}
-
-pub fn validate(datum: Datum, rdmr: Redeemer, ctx: ScriptContext) -> Bool {
-  when rdmr is {
-    Buy -> True
-    Sell -> datum.something == "Aiken"
-  }
+pub fn append(a: ByteArray, b: ByteArray) -> ByteArray {
+  appendByteString(a, b)
 }

examples/sample/scripts/swap.ak

@@ -0,0 +1,17 @@
+use sample/syntax.{append, Bool}
+
+pub type Datum {
+  something: String,
+}
+
+pub type Redeemer {
+  Buy
+  Sell
+}
+
+pub fn validate(datum: Datum, rdmr: Redeemer, ctx: ScriptContext) -> Bool {
+  when rdmr is {
+    Buy -> True
+    Sell -> datum.something == "Aiken"
+  }
+}