feat: adds unit tests for the object HEAD and GET controllers.

s3api/utils/utils.go

@@ -677,6 +677,9 @@ func GetStringPtr(str string) *string {
 // Converts any type to a string pointer
 func ConvertToStringPtr[T any](val T) *string {
 	str := fmt.Sprint(val)
+	if str == "" {
+		return nil
+	}
 	return &str
 }
 
@@ -694,6 +697,9 @@ func FormatDatePtrToString(date *time.Time, format string) *string {
 	if date == nil {
 		return nil
 	}
+	if date.IsZero() {
+		return nil
+	}
 
 	formatted := date.UTC().Format(format)
 	return &formatted