Write describe_number(n) that returns "zero" for 0, and otherwise a two-word description: the sign ("positive" or "negative") followed by the parity ("even" or "odd"), separated by a space.
Examples
Input: n = 4
Output: "positive even"
Input: n = -3
Output: "negative odd"
Input: n = 0
Output: "zero"
Constraints
-10**12 <= n <= 10**12(integer)
Goals
- Combine a sign test with a parity test
- Build a string from two decisions