fix(dogfood): implement erc20 interface

x/dogfood/keeper/impl_evm.go

@@ -1,12 +1,18 @@
 package keeper
 
 import (
+	"github.com/ExocoreNetwork/exocore/utils"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
+	erc20types "github.com/evmos/evmos/v14/x/erc20/types"
 	evmtypes "github.com/evmos/evmos/v14/x/evm/types"
 )
 
-var _ evmtypes.StakingKeeper = Keeper{}
+// interface guards
+var (
+	_ erc20types.StakingKeeper = Keeper{}
+	_ evmtypes.StakingKeeper   = Keeper{}
+)
 
 // GetValidatorByConsAddr is an implementation of the StakingKeeper interface
 // expected by the EVM module. It returns a validator given a consensus address.
@@ -23,3 +29,12 @@ func (k Keeper) GetValidatorByConsAddr(
 	}
 	return val.(stakingtypes.Validator), true
 }
+
+// BondDenom is an implementation of the StakingKeeper interface expected by the
+// ERC20 module. It returns the bond denom for the module. The ERC20 module uses
+// this function to determine whether a token sent (or received) over IBC is the
+// staking (==native) token. If it is, then the module lets the token through.
+// That is the behaviour we wish to retain with our chain as well.
+func (k Keeper) BondDenom(ctx sdk.Context) string {
+	return utils.BaseDenom
+}