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src/solution.js
Implement the fib() function and export it as default. The function calculates positive Fibonacci numbers. It takes an ordinal number (of a Fibonacci number) on input.
Formula:
f(0) = 0
f(1) = 1
f(n) = f(n-1) + f(n-2)
fib(3); // 2
fib(5); // 5
fib(10); // 55
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