diff --git a/Scarb.lock b/Scarb.lock
index 0bc093c..68ab755 100644
--- a/Scarb.lock
+++ b/Scarb.lock
@@ -2,7 +2,7 @@
 version = 1
 
 [[package]]
-name = "class_character"
+name = "class_character_v2"
 version = "0.1.0"
 dependencies = [
  "snforge_std",
diff --git a/Scarb.toml b/Scarb.toml
index 0b558de..b929f53 100644
--- a/Scarb.toml
+++ b/Scarb.toml
@@ -1,5 +1,5 @@
 [package]
-name = "class_character"
+name = "class_character_v2"
 version = "0.1.0"
 edition = "2023_10"
 
@@ -12,7 +12,9 @@ starknet = "2.4.0"
 [[target.starknet-contract]]
 sierra = true
 casm = true
-[tool.sncast.cohort_test_deploy]
-account = "cohort_test_deploy"
-accounts-file = "your_accounts_file_goes_here" # add the path to account file path (the json file)
-url = "your_rpc_url"
\ No newline at end of file
+
+[tool.sncast.test_1]
+account = "test_1"
+accounts-file = "/Users/mac/.starknet_accounts/starknet_open_zeppelin_accounts.json"
+url = "https://starknet-goerli.infura.io/v3/14d4909928f148238ba1da4db2886e77"
+
diff --git a/src/class_character_v2.cairo b/src/class_character_v2.cairo
index 92cb43a..6d1b507 100644
--- a/src/class_character_v2.cairo
+++ b/src/class_character_v2.cairo
@@ -1,5 +1,6 @@
 #[starknet::contract]
 mod ClassCharacterV2 {
+    use core::zeroable::Zeroable;
     use core::starknet::event::EventEmitter;
     use starknet::{ContractAddress, get_caller_address};
 
@@ -54,9 +55,13 @@ mod ClassCharacterV2 {
     ) {
         let owner = self.owner.read();
         let caller = get_caller_address();
+
         assert(owner == caller, 'caller not owner');
+
+        assert(!student_account.is_zero(), 'is zero address');
         assert(_name != '', 'name cannot be empty');
         assert(_age != 0, 'age cannot be zero');
+        assert(student_account != owner, 'not owner');
         let student_instance = Student {
             name: _name,
             age: _age,