CW-672: Enhance ETH Wallet Fee Calculation - Fix ERC20 Transaction Fee (#1548)

* fix: Eth transaction fees WIP

* Revert "fix: Eth transaction fees WIP"

This reverts commit b9a469bc7e22134d78bf0cc4c00485e1d4515ebd.

* fix: Modifying fee WIP

* fix: Enhance ETH Wallet fee calculation WIP

* feat: Enhance Transaction fees for ETH Transactions, Native transactions done, left with ERC20 transactions

* fix: Pre PR cleanups

* fix: ETH transaction fees for ERC20 transactions

* fix: ETH transaction fees for ERC20 transactions

* chore: Clarify comment in getEstimatedGas

* fix: Switch call to estimate gas units to a more cleaner approach

cw_evm/lib/evm_chain_client.dart

@@ -72,12 +72,12 @@ abstract class EVMChainClient {
     }
   }
 
-  Future<int> getGasBaseFee() async {
+  Future<int?> getGasBaseFee() async {
     try {
       final blockInfo = await _client!.getBlockInformation(isContainFullObj: false);
       final baseFee = blockInfo.baseFeePerGas;
 
-      return baseFee!.getInWei.toInt();
+      return baseFee?.getInWei.toInt();
     } catch (_) {
       return 0;
     }
@@ -110,19 +110,19 @@ abstract class EVMChainClient {
           EthereumAddress.fromHex(contractAddress),
         );
 
-        final transferFunction = contract.function('transferFrom');
+        final transfer = contract.function('transfer');
 
-        final estimatedGas = await _client!.estimateGas(
+        // Estimate gas units
+        final gasEstimate = await _client!.estimateGas(
           sender: senderAddress,
-          to: toAddress,
-          value: value,
-          data: transferFunction.encodeCall([
-            senderAddress,
+          to: EthereumAddress.fromHex(contractAddress),
+          data: transfer.encodeCall([
             toAddress,
             value.getInWei,
           ]),
         );
-        return estimatedGas.toInt();
+
+        return gasEstimate.toInt();
       }
     } catch (_) {
       return 0;

cw_evm/lib/evm_chain_wallet.dart

@@ -387,8 +387,6 @@ abstract class EVMChainWalletBase
 
       estimatedFeesForTransaction = BigInt.from(estimateFees);
 
-      debugPrint('Estimated Fees for Transaction: $estimatedFeesForTransaction');
-
       if (output.sendAll && transactionCurrency is! Erc20Token) {
         totalAmount = (erc20Balance.balance - estimatedFeesForTransaction);