remove more needless String conversions

src/aztec/encoder/token.rs

@@ -31,9 +31,9 @@ impl TokenType {
         match self {
             TokenType::Simple(a) => a.appendTo(bit_array, text),
             TokenType::BinaryShift(a) => a.appendTo(bit_array, text),
-            TokenType::Empty => Err(Exceptions::illegalState(String::from(
+            TokenType::Empty => Err(Exceptions::illegalState(
                 "cannot appendTo on Empty final item",
-            ))),
+            )),
         }
     }
 }