diff --git a/cryptor/rsa_private_example.pem b/cryptor/rsa_private_example.pem
index b06f5b0..a0b8f89 100644
--- a/cryptor/rsa_private_example.pem
+++ b/cryptor/rsa_private_example.pem
@@ -1,51 +1,51 @@
 -----BEGIN rsa private key-----
-MIIJKAIBAAKCAgEAvEyrhW9xP2vi2ONaQqILGOpqk3UJZRnT9ItEpefUvsjYeL3Q
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 -----END rsa private key-----
diff --git a/cryptor/rsa_public_example.pem b/cryptor/rsa_public_example.pem
index 85de307..a05d879 100644
--- a/cryptor/rsa_public_example.pem
+++ b/cryptor/rsa_public_example.pem
@@ -1,14 +1,14 @@
 -----BEGIN rsa public key-----
-MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAvEyrhW9xP2vi2ONaQqIL
-GOpqk3UJZRnT9ItEpefUvsjYeL3QdR9VMngVV8MtmhwqAut7h+aDGL4ZWIj4vh9e
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+X05C9FKEAehvubw9V/AMXcMCAwEAAQ==
 -----END rsa public key-----
diff --git a/slice/slice.go b/slice/slice.go
index ae7681e..cb19919 100644
--- a/slice/slice.go
+++ b/slice/slice.go
@@ -662,15 +662,22 @@ func IntSlice(slice any) []int {
 // DeleteAt delete the element of slice at index.
 // Play: https://go.dev/play/p/800B1dPBYyd
 func DeleteAt[T any](slice []T, index int) []T {
-	if index >= len(slice) {
-		index = len(slice) - 1
+	if index < 0 || index >= len(slice) {
+		return slice[:len(slice)-1]
 	}
 
-	result := make([]T, len(slice)-1)
-	copy(result, slice[:index])
-	copy(result[index:], slice[index+1:])
+	result := append([]T(nil), slice...)
+	copy(result[index:], result[index+1:])
 
-	return result
+	// Set the last element to zero value, clean up the memory.
+	result[len(result)-1] = zeroValue[T]()
+
+	return result[:len(result)-1]
+}
+
+func zeroValue[T any]() T {
+	var zero T
+	return zero
 }
 
 // DeleteRange delete the element of slice from start index to end index（exclude).