commit 4183f0740dd8220409570d0ab91f89ee54f1841a
Author: Benaya Nathanael Yeroham <benayanathanaelyeroham@MacBook-Pro-Benaya.local>
Date:   Wed Sep 24 16:53:21 2025 +0700

    auto commit

diff --git a/cmd/server/main.go b/cmd/server/main.go
new file mode 100644
index 0000000..305242e
--- /dev/null
+++ b/cmd/server/main.go
@@ -0,0 +1,49 @@
+package main
+
+import (
+	"5803024008/internal/db"
+    "5803024008/internal/handlers"
+	"log"
+	"net/http"
+
+	"github.com/gorilla/mux"
+)
+
+func home(w http.ResponseWriter, r *http.Request) {
+    w.Write([]byte("Hello broskie"))
+}
+
+func main() {
+    // Initialize database connection
+    database, err := db.InitDB()
+    if err != nil {
+        log.Fatal("Failed to connect to database:", err)
+    }
+    defer database.Close()
+    
+    // Set database connection for handlers
+    handlers.SetDatabase(database)
+    
+    // Use mux.NewRouter() to initialize Gorilla Mux router
+    r := mux.NewRouter()
+    r.HandleFunc("/", home).Methods("GET")
+    
+    // Group management routes
+    r.HandleFunc("/groups", handlers.CreateGroupHandler).Methods("POST")
+    r.HandleFunc("/groups/{groupId}", handlers.GetGroupHandler).Methods("GET")
+    r.HandleFunc("/groups/{groupId}", handlers.RemoveGroupHandler).Methods("DELETE")
+    
+    // Task management routes
+    r.HandleFunc("/groups/{groupId}/tasks", handlers.CreateTaskHandler).Methods("POST")
+    r.HandleFunc("/groups/{groupId}/tasks", handlers.DisplayTasksByGroupHandler).Methods("GET")
+    r.HandleFunc("/tasks", handlers.DisplayTasksHandler).Methods("GET")
+    r.HandleFunc("/tasks/{taskId}", handlers.GetTaskHandler).Methods("GET")
+    r.HandleFunc("/tasks/{taskId}", handlers.UpdateTaskHandler).Methods("PUT")
+    r.HandleFunc("/tasks/{taskId}", handlers.RemoveTaskHandler).Methods("DELETE")
+    r.HandleFunc("/tasks/{taskId}/done", handlers.MarkTaskDoneHandler).Methods("PUT")
+    
+    // Use the http.ListenAndServe() function to start a new web server.
+    log.Print("Starting server on :4000")
+    err = http.ListenAndServe(":4000", r)
+    log.Fatal(err)
+}
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..5585aea
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,7 @@
+module 5803024008
+
+go 1.25.0
+
+require github.com/gorilla/mux v1.8.1
+
+require github.com/lib/pq v1.10.9
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..2a964d7
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,4 @@
+github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
+github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
+github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
+github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
diff --git a/internal/db/connection.go b/internal/db/connection.go
new file mode 100644
index 0000000..c2a8b44
--- /dev/null
+++ b/internal/db/connection.go
@@ -0,0 +1,43 @@
+package db
+
+import (
+	"database/sql"
+	"fmt"
+
+	_ "github.com/lib/pq"
+)
+ 
+const (
+    host     = "202.46.28.160"
+	port     = 45432
+    user     = "5803024008"
+    password = "pw5803024008"
+    dbname   = "tgs01_5803024008"
+)
+ 
+// InitDB returns a database connection
+func InitDB() (*sql.DB, error) {
+    // connection string
+    psqlconn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable", host, port, user, password, dbname)
+         
+    // open database
+    db, err := sql.Open("postgres", psqlconn)
+    if err != nil {
+        return nil, err
+    }
+     
+    // check db
+    err = db.Ping()
+    if err != nil {
+        return nil, err
+    }
+ 
+    fmt.Println("Connected to database!")
+    return db, nil
+}
+ 
+func CheckError(err error) {
+    if err != nil {
+        panic(err)
+    }
+}
\ No newline at end of file
diff --git a/internal/db/group_queries.go b/internal/db/group_queries.go
new file mode 100644
index 0000000..1d4e3b1
--- /dev/null
+++ b/internal/db/group_queries.go
@@ -0,0 +1,49 @@
+package db
+
+import (
+	"database/sql"
+)
+
+// CreateGroup inserts a new group into the database
+func CreateGroup(db *sql.DB, groupName string) error {
+	query := `INSERT INTO groups (group_name) VALUES ($1)`
+	_, err := db.Exec(query, groupName)
+	return err
+}
+
+// GetGroupByID retrieves a group by its ID
+func GetGroupByID(db *sql.DB, groupID int) (*Groups, error) {
+	query := `SELECT group_id, group_name FROM groups WHERE group_id = $1`
+	row := db.QueryRow(query, groupID)
+	
+	var group Groups
+	err := row.Scan(&group.GroupId, &group.GroupName)
+	if err != nil {
+		return nil, err
+	}
+	
+	return &group, nil
+}
+
+// RemoveGroup deletes a group and all its associated tasks
+func RemoveGroup(db *sql.DB, groupID int) error {
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+	
+	// Delete all tasks in the group first
+	_, err = tx.Exec("DELETE FROM tasks WHERE group_id = $1", groupID)
+	if err != nil {
+		return err
+	}
+	
+	// Delete the group
+	_, err = tx.Exec("DELETE FROM groups WHERE group_id = $1", groupID)
+	if err != nil {
+		return err
+	}
+	
+	return tx.Commit()
+}
\ No newline at end of file
diff --git a/internal/db/models.go b/internal/db/models.go
new file mode 100644
index 0000000..239e511
--- /dev/null
+++ b/internal/db/models.go
@@ -0,0 +1,19 @@
+package db
+
+import (
+	"time"
+)
+
+type Groups struct{
+	GroupId int `json:"group_id"`
+	GroupName string `json:"group_name"`
+}
+
+type Tasks struct{
+	TaskID int `json:"task_id"`
+	TaskName string `json:"task_name"`           // Maps to "task" column in SQL
+	TaskDescription string `json:"task_desc"`    // Maps to "task_desc" column in SQL (changed from *int to string)
+	GroupID int `json:"group_id"`
+	IsDone bool `json:"is_done"`                 // Maps to "isdone" column in SQL
+	CreatedAt time.Time `json:"created_at"`
+}
\ No newline at end of file
diff --git a/internal/db/task_queries.go b/internal/db/task_queries.go
new file mode 100644
index 0000000..40aa506
--- /dev/null
+++ b/internal/db/task_queries.go
@@ -0,0 +1,99 @@
+package db
+
+import (
+	"database/sql"
+	"time"
+)
+
+// CreateTask inserts a new task into the database
+func CreateTask(db *sql.DB, taskName string, taskDescription string, groupID int) error {
+	query := `INSERT INTO tasks (task_name, task_desc, group_id, is_done, created_at) 
+			  VALUES ($1, $2, $3, $4, $5)`
+	_, err := db.Exec(query, taskName, taskDescription, groupID, false, time.Now())
+	return err
+}
+
+// GetAllTasks retrieves all tasks from the database
+func GetAllTasks(db *sql.DB) ([]Tasks, error) {
+	query := `SELECT task_id, task_name, task_desc, group_id, is_done, created_at 
+			  FROM tasks ORDER BY created_at DESC`
+	rows, err := db.Query(query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	
+	var tasks []Tasks
+	for rows.Next() {
+		var task Tasks
+		err := rows.Scan(&task.TaskID, &task.TaskName, &task.TaskDescription, 
+						&task.GroupID, &task.IsDone, &task.CreatedAt)
+		if err != nil {
+			return nil, err
+		}
+		tasks = append(tasks, task)
+	}
+	
+	return tasks, nil
+}
+
+// GetTaskByID retrieves a specific task by its ID
+func GetTaskByID(db *sql.DB, taskID int) (*Tasks, error) {
+	query := `SELECT task_id, task_name, task_desc, group_id, is_done, created_at 
+			  FROM tasks WHERE task_id = $1`
+	row := db.QueryRow(query, taskID)
+	
+	var task Tasks
+	err := row.Scan(&task.TaskID, &task.TaskName, &task.TaskDescription, 
+					&task.GroupID, &task.IsDone, &task.CreatedAt)
+	if err != nil {
+		return nil, err
+	}
+	
+	return &task, nil
+}
+
+// GetTasksByGroupID retrieves all tasks for a specific group
+func GetTasksByGroupID(db *sql.DB, groupID int) ([]Tasks, error) {
+	query := `SELECT task_id, task_name, task_desc, group_id, is_done, created_at 
+			  FROM tasks WHERE group_id = $1`
+	rows, err := db.Query(query, groupID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	
+	var tasks []Tasks
+	for rows.Next() {
+		var task Tasks
+		err := rows.Scan(&task.TaskID, &task.TaskName, &task.TaskDescription, 
+						&task.GroupID, &task.IsDone, &task.CreatedAt)
+		if err != nil {
+			return nil, err
+		}
+		tasks = append(tasks, task)
+	}
+	
+	return tasks, nil
+}
+
+// MarkTaskAsDone updates a task's status to completed
+func MarkTaskAsDone(db *sql.DB, taskID int) error {
+	query := `UPDATE tasks SET is_done = true WHERE task_id = $1`
+	_, err := db.Exec(query, taskID)
+	return err
+}
+
+// RemoveTask deletes a task from the database
+func RemoveTask(db *sql.DB, taskID int) error {
+	query := `DELETE FROM tasks WHERE task_id = $1`
+	_, err := db.Exec(query, taskID)
+	return err
+}
+
+// UpdateTask updates task name and description
+func UpdateTask(db *sql.DB, taskID int, taskName string, taskDescription string) error {
+	query := `UPDATE tasks SET task_name = $1, task_desc = $2 WHERE task_id = $3`
+	_, err := db.Exec(query, taskName, taskDescription, taskID)
+	return err
+}
\ No newline at end of file
diff --git a/internal/handlers/group_handlers.go b/internal/handlers/group_handlers.go
new file mode 100644
index 0000000..9e119c8
--- /dev/null
+++ b/internal/handlers/group_handlers.go
@@ -0,0 +1,139 @@
+package handlers
+
+import (
+	"5803024008/internal/db"
+	"database/sql"
+	"encoding/json"
+	"net/http"
+	"strconv"
+
+	"github.com/gorilla/mux"
+)
+
+type GroupRequest struct {
+	GroupName string `json:"group_name"`
+}
+
+type GroupResponse struct {
+	GroupID   int    `json:"group_id"`
+	GroupName string `json:"group_name"`
+}
+
+type ErrorResponse struct {
+	Error string `json:"error"`
+}
+
+// Database connection - you'll need to inject this or use a global variable
+var database *sql.DB
+
+func SetDatabase(db *sql.DB) {
+	database = db
+}
+
+func CreateGroupHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	var req GroupRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid JSON format"})
+		return
+	}
+
+	if req.GroupName == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Group name is required"})
+		return
+	}
+
+	if err := db.CreateGroup(database, req.GroupName); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to create group"})
+		return
+	}
+
+	w.WriteHeader(http.StatusCreated)
+	json.NewEncoder(w).Encode(map[string]string{"message": "Group created successfully"})
+}
+
+func DisplayTasksByGroupHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	vars := mux.Vars(r)
+	groupIDStr := vars["groupId"]
+
+	groupID, err := strconv.Atoi(groupIDStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid group ID"})
+		return
+	}
+
+	tasks, err := db.GetTasksByGroupID(database, groupID)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to retrieve tasks"})
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(tasks)
+}
+
+func RemoveGroupHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	vars := mux.Vars(r)
+	groupIDStr := vars["groupId"]
+
+	groupID, err := strconv.Atoi(groupIDStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid group ID"})
+		return
+	}
+
+	if err := db.RemoveGroup(database, groupID); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to remove group"})
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(map[string]string{"message": "Group removed successfully"})
+}
+
+func GetGroupHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	vars := mux.Vars(r)
+	groupIDStr := vars["groupId"]
+
+	groupID, err := strconv.Atoi(groupIDStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid group ID"})
+		return
+	}
+
+	group, err := db.GetGroupByID(database, groupID)
+	if err == sql.ErrNoRows {
+		w.WriteHeader(http.StatusNotFound)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Group not found"})
+		return
+	}
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to retrieve group"})
+		return
+	}
+
+	response := GroupResponse{
+		GroupID:   group.GroupId,
+		GroupName: group.GroupName,
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(response)
+}
+
diff --git a/internal/handlers/task_handlers.go b/internal/handlers/task_handlers.go
new file mode 100644
index 0000000..62466a7
--- /dev/null
+++ b/internal/handlers/task_handlers.go
@@ -0,0 +1,194 @@
+package handlers
+
+import (
+	"5803024008/internal/db"
+	"database/sql"
+	"encoding/json"
+	"net/http"
+	"strconv"
+
+	"github.com/gorilla/mux"
+)
+
+type TaskRequest struct {
+	TaskName        string `json:"task_name"`
+	TaskDescription string `json:"task_desc"`  // Changed from *string to string to match SQL NOT NULL
+}
+
+type TaskUpdateRequest struct {
+	TaskName        string `json:"task_name"`
+	TaskDescription string `json:"task_desc"`  // Changed from *string to string
+}
+
+func CreateTaskHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	vars := mux.Vars(r)
+	groupIDStr := vars["groupId"]
+
+	groupID, err := strconv.Atoi(groupIDStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid group ID"})
+		return
+	}
+
+	var req TaskRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid JSON format"})
+		return
+	}
+
+	if req.TaskName == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Task name is required"})
+		return
+	}
+
+	if req.TaskDescription == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Task description is required"})
+		return
+	}
+
+	if err := db.CreateTask(database, req.TaskName, req.TaskDescription, groupID); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to create task"})
+		return
+	}
+
+	w.WriteHeader(http.StatusCreated)
+	json.NewEncoder(w).Encode(map[string]string{"message": "Task created successfully"})
+}
+
+func DisplayTasksHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	tasks, err := db.GetAllTasks(database)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to retrieve tasks"})
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(tasks)
+}
+
+func GetTaskHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	vars := mux.Vars(r)
+	taskIDStr := vars["taskId"]
+
+	taskID, err := strconv.Atoi(taskIDStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid task ID"})
+		return
+	}
+
+	task, err := db.GetTaskByID(database, taskID)
+	if err == sql.ErrNoRows {
+		w.WriteHeader(http.StatusNotFound)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Task not found"})
+		return
+	}
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to retrieve task"})
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(task)
+}
+
+func MarkTaskDoneHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	vars := mux.Vars(r)
+	taskIDStr := vars["taskId"]
+
+	taskID, err := strconv.Atoi(taskIDStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid task ID"})
+		return
+	}
+
+	if err := db.MarkTaskAsDone(database, taskID); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to mark task as done"})
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(map[string]string{"message": "Task marked as done successfully"})
+}
+
+func RemoveTaskHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	vars := mux.Vars(r)
+	taskIDStr := vars["taskId"]
+
+	taskID, err := strconv.Atoi(taskIDStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid task ID"})
+		return
+	}
+
+	if err := db.RemoveTask(database, taskID); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to remove task"})
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(map[string]string{"message": "Task removed successfully"})
+}
+
+func UpdateTaskHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	vars := mux.Vars(r)
+	taskIDStr := vars["taskId"]
+
+	taskID, err := strconv.Atoi(taskIDStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid task ID"})
+		return
+	}
+
+	var req TaskUpdateRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Invalid JSON format"})
+		return
+	}
+
+	if req.TaskName == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Task name is required"})
+		return
+	}
+
+	if req.TaskDescription == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Task description is required"})
+		return
+	}
+
+	if err := db.UpdateTask(database, taskID, req.TaskName, req.TaskDescription); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "Failed to update task"})
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(map[string]string{"message": "Task updated successfully"})
+}
\ No newline at end of file
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..9c15de1
--- /dev/null
+++ b/main.go
@@ -0,0 +1,111 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/gorilla/mux"
+)
+
+func createGroupHandler(w http.ResponseWriter, r *http.Request) {
+    w.WriteHeader(http.StatusCreated)
+    w.Write([]byte("Group Created"))
+}
+
+func createTaskHandler(w http.ResponseWriter, r *http.Request) {
+    vars := mux.Vars(r)
+    groupID := vars["groupId"]
+    
+    w.WriteHeader(http.StatusCreated)
+    w.Write([]byte("Task Created in Group ID: " + groupID))
+}
+
+func displayTasksHandler(w http.ResponseWriter, r *http.Request) {
+    w.WriteHeader(http.StatusOK)
+    w.Write([]byte("Displaying All Tasks"))
+}
+
+func displayTasksByGroupHandler(w http.ResponseWriter, r *http.Request) {
+    vars := mux.Vars(r)
+    groupID := vars["groupId"]
+    
+    w.WriteHeader(http.StatusOK)
+    w.Write([]byte("Displaying Tasks for Group ID: " + groupID))
+}
+
+func getTaskHandler(w http.ResponseWriter, r *http.Request) {
+    vars := mux.Vars(r)
+    taskID := vars["taskId"]
+    
+    w.WriteHeader(http.StatusOK)
+    w.Write([]byte("Displaying Task ID: " + taskID))
+}
+
+func markTaskDoneHandler(w http.ResponseWriter, r *http.Request) {
+    vars := mux.Vars(r)
+    taskID := vars["taskId"]
+    
+    w.WriteHeader(http.StatusOK)
+    w.Write([]byte("Task ID " + taskID + " Marked as Done"))
+}
+
+func removeTaskHandler(w http.ResponseWriter, r *http.Request) {
+    vars := mux.Vars(r)
+    taskID := vars["taskId"]
+    
+    w.WriteHeader(http.StatusOK)
+    w.Write([]byte("Task ID " + taskID + " Removed"))
+}
+
+func removeGroupHandler(w http.ResponseWriter, r *http.Request) {
+    vars := mux.Vars(r)
+    groupID := vars["groupId"]
+    
+    w.WriteHeader(http.StatusOK)
+    w.Write([]byte("Group ID " + groupID + " Removed"))
+}
+
+func updateTaskHandler(w http.ResponseWriter, r *http.Request) {
+    vars := mux.Vars(r)
+    taskID := vars["taskId"]
+    
+    w.WriteHeader(http.StatusOK)
+    w.Write([]byte("Task ID " + taskID + " Updated"))
+}
+
+func getGroupHandler(w http.ResponseWriter, r *http.Request) {
+    vars := mux.Vars(r)
+    groupID := vars["groupId"]
+    
+    w.WriteHeader(http.StatusOK)
+    w.Write([]byte("Displaying Group ID: " + groupID))
+}
+
+func home(w http.ResponseWriter, r *http.Request) {
+    w.Write([]byte("Hello from Task Management API"))
+}
+
+func main() {
+    // Use mux.NewRouter() to initialize Gorilla Mux router
+    r := mux.NewRouter()
+    r.HandleFunc("/", home).Methods("GET")
+    
+    // Group management routes
+    r.HandleFunc("/groups", createGroupHandler).Methods("POST")
+    r.HandleFunc("/groups/{groupId}", getGroupHandler).Methods("GET")
+    r.HandleFunc("/groups/{groupId}", removeGroupHandler).Methods("DELETE")
+    
+    // Task management routes
+    r.HandleFunc("/groups/{groupId}/tasks", createTaskHandler).Methods("POST")
+    r.HandleFunc("/groups/{groupId}/tasks", displayTasksByGroupHandler).Methods("GET")
+    r.HandleFunc("/tasks", displayTasksHandler).Methods("GET")
+    r.HandleFunc("/tasks/{taskId}", getTaskHandler).Methods("GET")
+    r.HandleFunc("/tasks/{taskId}", updateTaskHandler).Methods("PUT")
+    r.HandleFunc("/tasks/{taskId}", removeTaskHandler).Methods("DELETE")
+    r.HandleFunc("/tasks/{taskId}/done", markTaskDoneHandler).Methods("PUT")
+    
+    // Use the http.ListenAndServe() function to start a new web server.
+    log.Print("Starting server on :4000")
+    err := http.ListenAndServe(":4000", r)
+    log.Fatal(err)
+}
\ No newline at end of file