fix issues

eth/tracers/native/contract.go

@@ -33,7 +33,7 @@ func init() {
 }
 
 type contractTracer struct {
-	Addrs     []string
+	Addrs     map[string]string
 	config    contractTracerConfig
 	interrupt uint32 // Atomic flag to signal execution interruption
 	reason    error  // Textual reason for the interruption
@@ -52,7 +52,7 @@ func NewContractTracer(cfg json.RawMessage) (tracers.Tracer, error) {
 		}
 	}
 	t := &contractTracer{
-		Addrs:  make([]string, 0),
+		Addrs:  make(map[string]string, 1),
 		config: config,
 	}
 	// handle invalid opcode case
@@ -67,7 +67,7 @@ func NewContractTracer(cfg json.RawMessage) (tracers.Tracer, error) {
 func (t *contractTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
 	//When not searching for opcodes, record the contract address.
 	if create && t.config.OpCode == "" {
-		t.Addrs = append(t.Addrs, addrToHex(to))
+		t.Addrs[addrToHex(to)] = ""
 	}
 }
 
@@ -87,8 +87,7 @@ func (t *contractTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas,
 	targetOp := vm.StringToOp(t.config.OpCode)
 	if op == targetOp {
 		addr := scope.Contract.Address()
-		t.Addrs = append(t.Addrs, addrToHex(addr))
-		t.Stop(nil)
+		t.Addrs[addrToHex(addr)] = ""
 	}
 }
 
@@ -102,7 +101,13 @@ func (t *contractTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
 }
 
 func (t *contractTracer) GetResult() (json.RawMessage, error) {
-	res, err := json.Marshal(t.Addrs)
+	// return Address array without duplicate address
+	AddrArray := make([]string, 0, len(t.Addrs))
+	for addr := range t.Addrs {
+		AddrArray = append(AddrArray, addr)
+	}
+
+	res, err := json.Marshal(AddrArray)
 	if err != nil {
 		return nil, err
 	}