add contract type and use wallet_lib::Wallet in wallet_contract example
@@ -96,6 +96,9 @@ wallet_lib = { path = "../wallet_lib" }
Now, open up `main.sw` in `wallet_contract/src` and copy and paste the following code:
```sway
+contract;
+use wallet_lib::Wallet;
+
impl Wallet for Contract {
fn receive_funds() {
}
