eth/tracers: enforce camel case variable names (#19057)

eth/tracers/tracers_test.go

@@ -121,7 +121,7 @@ type callTracerTest struct {
 }
 
 func TestPrestateTracerCreate2(t *testing.T) {
-	unsigned_tx := types.NewTransaction(1, common.HexToAddress("0x00000000000000000000000000000000deadbeef"),
+	unsignedTx := types.NewTransaction(1, common.HexToAddress("0x00000000000000000000000000000000deadbeef"),
 		new(big.Int), 5000000, big.NewInt(1), []byte{})
 
 	privateKeyECDSA, err := ecdsa.GenerateKey(crypto.S256(), rand.Reader)
@@ -129,7 +129,7 @@ func TestPrestateTracerCreate2(t *testing.T) {
 		t.Fatalf("err %v", err)
 	}
 	signer := types.NewEIP155Signer(big.NewInt(1))
-	tx, err := types.SignTx(unsigned_tx, signer, privateKeyECDSA)
+	tx, err := types.SignTx(unsignedTx, signer, privateKeyECDSA)
 	if err != nil {
 		t.Fatalf("err %v", err)
 	}