update EVM util scripts & transactions

cadence/scripts/evm/call.cdc

@@ -36,5 +36,9 @@ access(all) fun main(
         value: EVM.Balance(attoflow: 0)
     )
 
-    return EVM.decodeABI(types: getTypeArray(typeIdentifiers), data: evmResult.data)
+    if typeIdentifiers.length == 0 {
+        return []
+    } else {
+        return EVM.decodeABI(types: getTypeArray(typeIdentifiers), data: evmResult.data)
+    }
 }

cadence/scripts/evm/get_evm_address_string.cdc

@@ -3,13 +3,9 @@ import "EVM"
 /// Returns the hex encoded address of the COA in the given Flow address
 ///
 access(all) fun main(flowAddress: Address): String? {
-    if let address: EVM.EVMAddress = getAuthAccount<auth(BorrowValue) &Account>(flowAddress)
-        .storage.borrow<&EVM.CadenceOwnedAccount>(from: /storage/evm)?.address() {
-        let bytes: [UInt8] = []
-        for byte in address.bytes {
-            bytes.append(byte)
-        }
-        return String.encodeHex(bytes)
-    }
-    return nil
+    return getAuthAccount<auth(BorrowValue) &Account>(flowAddress)
+        .storage.borrow<&EVM.CadenceOwnedAccount>(from: /storage/evm)
+        ?.address()
+        ?.toString()
+        ?? nil
 }

cadence/scripts/evm/get_evm_address_string_from_bytes.cdc

@@ -5,7 +5,5 @@ import "EVM"
 access(all) fun main(bytes: [UInt8]): String? {
     let constBytes = bytes.toConstantSized<[UInt8; 20]>()
         ?? panic("Problem converting provided EVMAddress compatible byte array - check byte array contains 20 bytes")
-    return EVM.EVMAddress(
-        bytes: constBytes
-    )
+    return EVM.EVMAddress(bytes: constBytes).toString()
 }

cadence/transactions/evm/destroy_coa.cdc

@@ -1,9 +1,21 @@
+import "Burner"
 import "EVM"
 
-/// !!! CAUTION: Destroys the COA in the signer's account !!! 
+/// !!! CAUTION: Destroys the COA in the signer's account !!!
 ///
 transaction {
-    prepare(signer: auth(LoadValue) &Account) {
-        destroy signer.storage.load<@EVM.CadenceOwnedAccount>(from: /storage/evm)!
+    prepare(signer: auth(LoadValue, StorageCapabilities, UnpublishCapability) &Account) {
+        // Unpublish the COA capability
+        signer.capabilities.unpublish(/public/evm)
+
+        // Delete all COA capabilities
+        signer.capabilities.storage.forEachController(forPath: /storage/evm, fun (controller: &StorageCapabilityController): Bool {
+            controller.delete()
+            return true
+        })
+
+        // Destroy the COA
+        let coa <- signer.storage.load<@EVM.CadenceOwnedAccount>(from: /storage/evm)!
+        Burner.burn(<-coa)
     }
 }

cadence/transactions/evm/withdraw.cdc

@@ -28,6 +28,6 @@ transaction(amount: UFix64) {
     }
 
     post {
-        self.vault.balance == self.preBalance + amount: "Problem transfering Flow between environments!"
+        self.vault.balance == self.preBalance + amount: "Problem transferring Flow between environments!"
     }
 }