Simplify getTradingFees - remove duplicate var

exchanges/bitstamp/bitstamp.go

@@ -85,11 +85,10 @@ func (b *Bitstamp) GetFee(ctx context.Context, feeBuilder *exchange.FeeBuilder)
 
 // GetTradingFee returns a trading fee based on a currency
 func (b *Bitstamp) getTradingFee(ctx context.Context, feeBuilder *exchange.FeeBuilder) (float64, error) {
-	tradingFees, err := b.GetAccountTradingFee(ctx, feeBuilder.Pair)
+	fees, err := b.GetAccountTradingFee(ctx, feeBuilder.Pair)
 	if err != nil {
 		return 0, err
 	}
-	fees := tradingFees
 	fee := fees.Fees.Taker
 	if feeBuilder.IsMaker {
 		fee = fees.Fees.Maker

go.mod

@@ -4,6 +4,7 @@ go 1.20
 
 require (
 	github.com/d5/tengo/v2 v2.16.1
+	github.com/davecgh/go-spew v1.1.1
 	github.com/gofrs/uuid v4.4.0+incompatible
 	github.com/google/go-querystring v1.1.0
 	github.com/gorilla/mux v1.8.0
@@ -17,6 +18,7 @@ require (
 	github.com/pquerna/otp v1.4.0
 	github.com/shopspring/decimal v1.3.1
 	github.com/spf13/viper v1.16.0
+	github.com/stretchr/testify v1.8.3
 	github.com/thrasher-corp/gct-ta v0.0.0-20200623072738-f2b55b7f9f41
 	github.com/thrasher-corp/goose v2.7.0-rc4.0.20191002032028-0f2c2a27abdb+incompatible
 	github.com/thrasher-corp/sqlboiler v1.0.1-0.20191001234224-71e17f37a85e
@@ -41,6 +43,7 @@ require (
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.0.8 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/spf13/afero v1.9.5 // indirect
 	github.com/spf13/cast v1.5.1 // indirect