Please read the following requirement:

I want to create a multiplication table. The input should be 2 integers specifying the start and the end of the table:

AC1: The start number must be smaller than or equal to the end number. Or the function will return null.

AC2: The start number and the end number can be any number in a range of 1 to 1000 (inclusive).

AC3: The output should be a string represents the multiplication table. Suppose that the start number is 2 and the end number is 4, the output should be something like the following. Please note that all columns should be aligned properly.

2*2=4
2*3=6  3*3=9
2*4=8  3*4=12  4*4=16

• Please draw task diagrams.
• Please define all the methods according to your task diagram.
• Please write down a test case using given...when...then pattern for a leaf block. Then implement the block to pass the test.
• Please continue doing this work until all the requirement has been fulfilled.,