If length, breadth and height of the walls are given, find the area of the four walls.
In the test cases you wrote "your_fcn_name(x)" and not "your_fcn_name(l,b,h)" ;-)
Sum the Digits of a Number
Duplicate a character
Tiling a matrix
Area of a disk
Find the dimensions of a matrix
Find the square of the sum of the digits of a number
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