add burn functionality

Author: dadadave80

src/interfaces/i_ticket_721.cairo

@@ -6,6 +6,7 @@ pub trait ITicket721<TContractState> {
     fn initialize(ref self: TContractState, name: ByteArray, symbol: ByteArray, uri: ByteArray);
     fn pause(ref self: TContractState);
     fn unpause(ref self: TContractState);
+    fn burn(ref self: TContractState, token_id: u256);
     fn safe_mint(ref self: TContractState, recipient: ContractAddress);
     fn update_name(ref self: TContractState, new_name: ByteArray);
     fn update_symbol(ref self: TContractState, new_symbol: ByteArray);

src/tickets/ticket_721.cairo

@@ -4,7 +4,7 @@ pub mod Ticket721 {
     //*//////////////////////////////////////////////////////////////////////////
     //                                 IMPORTS
     //////////////////////////////////////////////////////////////////////////*//
-    use starknet::{ContractAddress, ClassHash, storage::{StoragePointerWriteAccess},};
+    use starknet::{ContractAddress, ClassHash, storage::{StoragePointerWriteAccess}, get_caller_address};
     use openzeppelin::{
         access::accesscontrol::{AccessControlComponent, DEFAULT_ADMIN_ROLE},
         introspection::src5::SRC5Component,
@@ -15,6 +15,7 @@ pub mod Ticket721 {
         },
         upgrades::{interface::IUpgradeable, UpgradeableComponent},
     };
+    use core::num::traits::Zero;
 
     //*//////////////////////////////////////////////////////////////////////////
     //                                COMPONENTS
@@ -149,6 +150,11 @@ pub mod Ticket721 {
             self.pausable.unpause();
         }
 
+        #[external(v0)]
+        fn burn(ref self: ContractState, token_id: u256) {
+            self.erc721.update(Zero::zero(), token_id, get_caller_address());
+        }
+
         #[external(v0)]
         fn safe_mint(ref self: ContractState, recipient: ContractAddress,) {
             self.accesscontrol.assert_only_role(DEFAULT_ADMIN_ROLE);