add answers.md

src/main/java/dev/banking/model/BankAccount.java

@@ -52,19 +52,7 @@ public class BankAccount {
         }
     }
 
-    /*
-     * TODO:
-     * Transfer money between two accounts atomically.
-     *
-     * IMPORTANT REQUIREMENTS:
-     * - Must be atomic (no partial transfer)
-     * - Must be deadlock-free
-     * - Must protect both source and target accounts
-     *
-     * HINT:
-     * - Consider global lock ordering using accountId
-     * - Or tryLock with retry strategy
-     */
+
     public void transfer(BankAccount target, long amount) {
         BankAccount first = this.accountId < target.accountId ? this : target;
         BankAccount second = this.accountId > target.accountId ? this : target;