feat: modify the HelloStarknet contract

starknet_contracts/src/contracts/HelloStarknet.cairo

@@ -1,11 +1,10 @@
-/// Simple contract for managing balance.
-#[Starknet::contract]
+#[starknet::contract]
 pub mod HelloStarknet {
 
-    use Starknet_contracts::interfaces::IHelloStarknet::IHelloStarknet;
+    use starknet_contracts::interfaces::IHelloStarknet::IHelloStarknet;
     // use Starknet::storage::{StoragePointerReadAccess, StoragePathEntry, StoragePointerWriteAccess, Map };
-    use Starknet::storage::{Map, StorageMapReadAccess, StorageMapWriteAccess, StoragePointerReadAccess, StoragePointerWriteAccess };
-    use Starknet::{ContractAddress, get_caller_address};
+    use starknet::storage::{Map, StorageMapReadAccess, StorageMapWriteAccess, StoragePointerReadAccess, StoragePointerWriteAccess };
+    use starknet::{ContractAddress, get_caller_address};
 
     #[storage]
     struct Storage {
@@ -14,17 +13,27 @@ pub mod HelloStarknet {
     }
 
     #[event]
-    #[derive(Drop, Starknet::Event)]
+    #[derive(Drop, starknet::Event)]
     pub enum Event {
         Balance : BalanceIncreased,
+        Balances: BalanceChanged,
     }
 
-    #[derive(Drop, Starknet::Event)]
+    #[derive(Drop, starknet::Event)]
     pub struct BalanceIncreased {
         pub caller: ContractAddress,
         pub amount: felt252,
     }
 
+    #[derive(Drop, starknet::Event)]
+    pub struct BalanceChanged {
+        pub caller: ContractAddress,
+        pub amount: felt252,
+        pub old_balance: felt252,
+    }
+
+
+
     #[abi(embed_v0)]
     impl HelloStarknetImpl of IHelloStarknet<ContractState> {
         fn increase_balance(ref self: ContractState, amount: felt252) {
@@ -45,6 +54,20 @@ pub mod HelloStarknet {
             self.emit(BalanceIncreased{caller, amount});
         }
 
+        fn set_balance(ref self: ContractState, amount: felt252) {
+            let caller = get_caller_address();
+            let old_bal = self.balances.read(caller);
+            self.balances.write(caller, amount);
+            self.emit(BalanceChanged{caller, amount, old_balance: old_bal});
+
+
+
+        }
+
+        fn reset_balance(ref self: ContractState){
+            self.balance.write(0);
+        }
+
         fn get_balance(self: @ContractState) -> felt252 {
             self.balance.read()
         }