add FixToNo0x

str.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"math/rand"
+	"os"
 	"strings"
 	"time"
 )
@@ -104,6 +105,7 @@ func JsonstrToStrMap(jsonstr string) (m map[string]string) {
 }
 
 // string to string map to string
+//
 //	example: "K1:V1;K2:V2"
 //	      => {K1:V1, K2:V2}
 func StringToStrMap(str string, sep1, sep2 string) (m map[string]string) {
@@ -115,3 +117,20 @@ func StringToStrMap(str string, sep1, sep2 string) (m map[string]string) {
 	}
 	return m
 }
+
+// get os env with default
+func GetEnvDefault(key, defval string) string {
+	if val, ok := os.LookupEnv(key); ok {
+		return val
+	} else {
+		return defval
+	}
+}
+
+// fix hex string to no 0x prefix
+func FixToNo0x(hexstr string) string {
+	if strings.HasPrefix(hexstr, "0x") {
+		return hexstr[2:]
+	}
+	return hexstr
+}