Add missing headers for newly added functions

src/withdrawMoney.h

@@ -1,4 +1,6 @@
 #include <stdio.h>
+#include <stdbool.h>
 
 void withdraw(int user_id);
-void initiateWithdraw(float amountToWithdraw, float availableAccountBalance);
+float initiateWithdraw(float amountToWithdraw, float availableAccountBalance);
+void notifyCustomer(amountToWithdraw, remainingAccountBalance);