Solve task 1.2 and 1.3

project_tasks/src/main/scala/Account.scala

@@ -9,13 +9,19 @@ class Account(val bank: Bank, initialBalance: Double) {
     // TODO
     // for project task 1.2: implement functions
     // for project task 1.3: change return type and update function bodies
-    def withdraw(amount: Double): Unit = ???
-    def deposit (amount: Double): Unit = ???
-    def getBalanceAmount: Double       = ???
+    def withdraw(amount: Double): Either[Unit, String] = this.synchronized({
+      if (amount < 0 || balance.amount < amount) return Right("OOF");
+      Left({ balance.amount -= amount })
+    })
+
+    def deposit (amount: Double): Either[Unit, String] = this.synchronized({
+      if (amount < 0) return Right("OOF");
+      Left({ balance.amount += amount })
+    })
+
+    def getBalanceAmount: Double = this.synchronized(balance.amount)
 
     def transferTo(account: Account, amount: Double) = {
         bank addTransactionToQueue (this, account, amount)
     }
-
-
 }