fix urls (#76)

* fix urls

* nit

client/client.go

@@ -2,7 +2,6 @@ package client
 
 import (
 	"context"
-	"fmt"
 	"math/big"
 	"strings"
 
@@ -16,8 +15,6 @@ import (
 // Interface compliance
 var _ Client = &client{}
 
-const prefixEth = "/ext/bc/C/rpc"
-
 type Client interface {
 	IsBootstrapped(context.Context, string) (bool, error)
 	ChainID(context.Context) (*big.Int, error)
@@ -51,9 +48,8 @@ type client struct {
 // NewClient returns a new client for Avalanche APIs
 func NewClient(endpoint string) (Client, error) {
 	endpoint = strings.TrimSuffix(endpoint, "/")
-	endpointURL := fmt.Sprintf("%s%s", endpoint, prefixEth)
 
-	eth, err := NewEthClient(endpointURL)
+	eth, err := NewEthClient(endpoint)
 	if err != nil {
 		return nil, err
 	}

client/eth.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/ava-labs/avalanchego/utils/rpc"
 	"github.com/ava-labs/coreth/ethclient"
@@ -10,6 +11,7 @@ import (
 
 var (
 	tracerTimeout = "180s"
+	prefixEth     = "/ext/bc/C/rpc"
 )
 
 // EthClient provides access to Coreth API
@@ -20,15 +22,17 @@ type EthClient struct {
 }
 
 // NewEthClient returns a new EVM client
-func NewEthClient(endpointURL string) (*EthClient, error) {
+func NewEthClient(endpoint string) (*EthClient, error) {
+	endpointURL := fmt.Sprintf("%s%s", endpoint, prefixEth)
+
 	c, err := ethclient.Dial(endpointURL)
 	if err != nil {
 		return nil, err
 	}
 
 	return &EthClient{
 		Client: c,
-		rpc:    rpc.NewRPCRequester(endpointURL),
+		rpc:    rpc.NewRPCRequester(endpoint),
 		traceConfig: &tracers.TraceConfig{
 			Timeout: &tracerTimeout,
 			Tracer:  &jsTracer,