add core/error/util files

pkg/utils/converter.go

@@ -0,0 +1,39 @@
+package utils
+
+import "strconv"
+
+func Int32ToString(num int) string {
+	return strconv.Itoa(num)
+}
+
+func StringToInt32(str string) (int, error) {
+	return strconv.Atoi(str)
+}
+
+func StringTryToInt32(str string,  defaultValue int) int {
+	num, err := StringToInt32(str)
+
+	if err != nil {
+		return defaultValue
+	}
+
+	return num
+}
+
+func Int64ToString(num int64) string {
+	return strconv.FormatInt(num, 10)
+}
+
+func StringToInt64(str string) (int64, error) {
+	return strconv.ParseInt(str, 10, 64)
+}
+
+func StringTryToInt64(str string, defaultValue int64) int64 {
+	num, err := StringToInt64(str)
+
+	if err != nil {
+		return defaultValue
+	}
+
+	return num
+}