restructure project

internal/object/str.go

@@ -0,0 +1,48 @@
+package object
+
+import (
+	"fmt"
+	"unicode/utf8"
+)
+
+type String struct {
+	Value string
+}
+
+func (s *String) Len() int {
+	return utf8.RuneCountInString(s.Value)
+}
+
+func (s *String) Bool() bool {
+	return s.Value != ""
+}
+
+func (s *String) Type() ObjectType {
+	return STRING_OBJ
+}
+
+func (s *String) Inspect() string {
+	return fmt.Sprintf("%#v", s.Value)
+}
+
+func (s *String) Clone() Object {
+	return &String{Value: s.Value}
+}
+
+func (s *String) String() string {
+	return s.Value
+}
+
+func (s *String) Compare(other Object) int {
+	if obj, ok := other.(*String); ok {
+		switch {
+		case s.Value < obj.Value:
+			return -1
+		case s.Value > obj.Value:
+			return 1
+		default:
+			return 0
+		}
+	}
+	return 1
+}