added new marshal error class

utilities/marshal_error.go

@@ -0,0 +1,28 @@
+package utilities
+
+import (
+	"fmt"
+)
+
+type MarshalError struct {
+	structName string
+	innerError error
+}
+
+func NewMarshalError(structName string, err error) MarshalError {
+	return MarshalError{
+		structName: structName,
+		innerError: err,
+	}
+}
+
+// Error implements the Error method for the error interface.
+// It returns a string representation of the ApiError instance when used in an error context.
+func (a MarshalError) Error() string {
+	indent := "\n\t=>"
+	switch a.innerError.(type) {
+	case MarshalError:
+		indent = "."
+	}
+	return fmt.Sprintf("%v %v %v", a.structName, indent, a.innerError)
+}