Fibonacci Numbers

Statement

Implement a function to find the n$^{th}$ Fibonacci number in the Fibonacci sequence.

Fibonacci numbers form a sequence known as the Fibonacci sequence, where each number is the sum of two preceding ones, starting from $0$ and $1$.

The Fibonacci numbers are defined as:

• $F_0= 0$
• $F_1= 1$
• $F_n= F_{n-1} + F_{n-2}$, for $n \geq 2$