feat: on fmt if label and name are the same only print one

examples/sample/validators/swap.ak

@@ -3,21 +3,22 @@ use aiken/string
 use aiken/hash.{Blake2b_224, Hash}
 use aiken/transaction.{ScriptContext}
 use aiken/transaction/credential.{VerificationKey}
- 
+
 pub type Datum {
   owner: Hash<Blake2b_224, VerificationKey>,
 }
- 
+
 pub type Redeemer {
   msg: ByteArray,
 }
- 
+
 pub fn spend(datum: Datum, redeemer: Redeemer, context: ScriptContext) -> Bool {
   let must_say_hello = string.from_bytearray(redeemer.msg) == "Hello, World!"
+
   let must_be_signed =
     context.transaction.extra_signatories
     |> list.any(fn(vk) { vk == datum.owner })
- 
+
   must_say_hello && must_be_signed
 }