feat: Add error message with index and length information

This commit updates the code in `genericlist.go` to improve error handling in the `Remove` method. A more descriptive error message is now generated when the index is out of range. The new error message includes both the index and the length of the list. This change improves the user experience by providing more helpful information when an error occurs.

cmd/genericlist/genericlist.go

@@ -3,6 +3,8 @@
 // the standard comparison operators (<, >, ==, etc.).
 package genericlist
 
+import "fmt"
+
 // GenericList represents a type-safe, dynamic list of comparable items.
 type GenericList[T comparable] struct {
 	data []T
@@ -22,7 +24,8 @@ func (g *GenericList[T]) Add(value T) {
 // Panics if the index is out of bounds.
 func (g *GenericList[T]) Remove(i int) {
 	if i < 0 || i > len(g.data)-1 {
-		panic("index is out of range")
+		msg := fmt.Sprintf("index is out of range: %d : %d", i, len(g.data))
+		panic(msg)
 	}
 	g.data = append(g.data[:i], g.data[i+1:]...)
 }

cmd/genericlist/genericlist_test.go

@@ -1,6 +1,7 @@
 package genericlist
 
 import (
+	"math/rand"
 	"testing"
 )
 
@@ -562,3 +563,44 @@ func shouldPanic(t *testing.T, f func()) {
 	f()
 	t.Errorf("should have panicked")
 }
+
+func BenchmarkAdd(b *testing.B) {
+	list := &GenericList[int]{}
+	list.New()
+
+	for i := 0; i < b.N; i++ {
+		list.Add(rand.Intn(100))
+	}
+}
+
+func BenchmarkRemove(b *testing.B) {
+	list := &GenericList[int]{}
+	list.New()
+
+	for i := 0; i < 1000; i++ {
+		list.Add(rand.Int())
+	}
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		list.RemoveByValue(rand.Int())
+	}
+}
+
+func BenchmarkMap(b *testing.B) {
+	list := &GenericList[int]{}
+	list.New()
+
+	for i := 0; i < 1000; i++ {
+		list.Add(rand.Intn(100))
+	}
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		list.Map(func(item int) int {
+			return item * 2
+		})
+	}
+}