Update bank_account.h

interface

Author: arajgarhia-gh

exercises/practice/bank-account/bank_account.h

@@ -1,6 +1,23 @@
 #pragma once
 
 namespace Bankaccount {
-class Bankaccount {};  // class Bankaccount
+class Bankaccount {
+  public:
+    Bankaccount() {
+    }
+
+    void open();
+    void close();
+    void deposit(int amount);
+    int balance();
+    void withdraw();
+ private:
+   bool is_open_ = false;
+   int amount_;
+    
+    
+    
+
+};  // class Bankaccount
 
 }  // namespace Bankaccount