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in case 4 we should undo right..so inorder to do that we should push empty string..then we can add it to the string and make it when we need to undo..even i got the same doubt initially..once u pls trace it u will get that...
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in case 4 we should undo right..so inorder to do that we should push empty string..then we can add it to the string and make it when we need to undo..even i got the same doubt initially..once u pls trace it u will get that...