Nice expression for the usage test. Maybe one can add function "dec2base", cause the return type is a String.
The problem description should mention that dec2base isn't allowed either.
This will fail to detect certain palindromes which contain zero e.g. 10101 however the test suite doesn't (yet) contain any such.
There's something strange with the Cody test suites today...
Project Euler: Problem 8, Find largest product in a large string of numbers
Make one big string out of two smaller strings
Generate a string like abbcccddddeeeee
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Number of 1s in the Binary Representation of a Number
Check to see if a Sudoku Puzzle is Solved
Return the first and last characters of a character array
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