Refactor[BE]: refactor expense category handling to use constants for BOP and NON-BOP

internal/utils/constant.go

@@ -135,6 +135,17 @@ const (
 	SupplierCategorySapronak SupplierCategory = "SAPRONAK"
 )
 
+// -------------------------------------------------------------------
+// ExpenseCategory
+// -------------------------------------------------------------------
+
+type ExpenseCategory string
+
+const (
+	ExpenseCategoryBOP    ExpenseCategory = "BOP"
+	ExpenseCategoryNonBOP ExpenseCategory = "NON-BOP"
+)
+
 // -------------------------------------------------------------------
 // Kandang Status
 // -------------------------------------------------------------------
@@ -429,6 +440,14 @@ func IsValidSupplierCategory(v string) bool {
 	return false
 }
 
+func IsValidExpenseCategory(v string) bool {
+	switch ExpenseCategory(v) {
+	case ExpenseCategoryBOP, ExpenseCategoryNonBOP:
+		return true
+	}
+	return false
+}
+
 // example use
 
 // Recording helper