Can someone please tell whats wrong?

ivate: II One stacks of strings and the page you are currently viewing is all that is used here Stack history; string currenturl; ublic: II Implement the constructor to initialize your object II with a new current page at defaulturl II At this point, your history should be empty BrowserHistory(string defaultUr1) \{ currentUrl=defaulturl; 3 II Implement the getcurrentPage method to return II the most recently visited page string getCurrentPage() \{ return currentur1; \} I/ Implement the goToPage method, which will take in a url II and update the current page II It should also push the previous page to the history II returns nothing void goToPage(string inUrl) \{ history.push(inUr1); currentUrl = inUrl 1 II Implement goBack method to go to the previous page in history II If there is no previous page to move to, ll print a message and do nothing void goBack() \{ 3 II Implement method canGoBack, II which determines whether there is a previous url in the history II Hint: your Stack class has a useful method for this! bool canGoBack()