remove the duplicates in department Name

src/controllers/departmentController.js

@@ -1128,16 +1128,16 @@ const getDepartmentsByName = async (officeName, city, departmentName) => {
         .select("departmentName -_id")
         .lean();
   
-      return result.map(doc => doc.departmentName);
+      // Remove duplicate department names
+      return [...new Set(result.map(doc => doc.departmentName))];
     } catch (error) {
       console.error("Error fetching departments by city:", error);
       throw new Error("Error fetching departments by city.");
     }
   };
   
-
-// API route handler
-exports.getDepartmentsByCity = async (req, reply) => {
+  // API route handler
+  exports.getDepartmentsByCity = async (req, reply) => {
     try {
       const { city } = req.params;
       if (!city || city.trim() === "") {
@@ -1155,4 +1155,5 @@ exports.getDepartmentsByCity = async (req, reply) => {
       console.error("API Error:", error);
       reply.status(500).send({ message: error.message });
     }
-};
+  };
+