Also add String() method for contract events

xdr/event.go

@@ -0,0 +1,23 @@
+package xdr
+
+import (
+	"encoding/hex"
+	"fmt"
+)
+
+func (ce ContractEvent) String() string {
+	result := ce.Type.String() + "("
+	if ce.ContractId != nil {
+		result += hex.EncodeToString(ce.ContractId[:]) + ","
+	}
+	result += ce.Body.String()
+	return result
+}
+
+func (eb ContractEventBody) String() string {
+	return fmt.Sprintf("%+v", *eb.V0)
+}
+
+func (de DiagnosticEvent) String() string {
+	return fmt.Sprintf("%s, successful call: %t", de.Event, de.InSuccessfulContractCall)
+}

xdr/scval.go

@@ -229,7 +229,7 @@ func (s ScVal) String() string {
 	case ScValTypeScvI64:
 		return fmt.Sprintf("%d", *s.I64)
 	case ScValTypeScvTimepoint:
-		return fmt.Sprintf("%s", time.Unix(int64(*s.Timepoint), 0))
+		return time.Unix(int64(*s.Timepoint), 0).String()
 	case ScValTypeScvDuration:
 		return fmt.Sprintf("%d", *s.Duration)
 	case ScValTypeScvU128: