Your last test case is accidentally all commented out, so isn't a real test case
Thanks for the note Aurelien. I added to the test suite.
the largest palindrome made from the product of 9999 is 99977999， not 99000099！
and x=999，y=997799, not 906609.
x=2500, y=6249246, not 6167616
x=100, y=999, not 9009
zd c, 99977999 cannot be written as the product of two numbers less than or equal to 9999.
Size 42 ! wow should be the best solution
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