Create a class called BarChartTester that contains the main method. The method should ask the user for a number and use the BarChart class to create a BarChart object that displays the appropriate number of asterisks. This should be repeated five times.

The BarChartTester class should produce the following example input/output:

Enter a number: 5

*****

Enter a number: 15

***************

Enter a number: 7

*******

Enter a number: 3

***

Enter a number: 23

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