task.md

Last Digit of Fibonacci Number

Implement last_digit_of_fibonacci_number function that takes an integer $0 \le n \le 10^7$ and returns the last digit of $F_n$.

As usual, after implementing a solution, do the following:

• Switch to the unit tests file, add a few new tests to the already implemented ones, and run the tests.
• If a bug is found, fix it and run the tests again.
• Then, check your solution in PyCharm Edu.
• Finally, uncomment the last few lines in the source file and submit the solution to Coursera or edX.

Please follow the same steps for all the forthcoming programming challenges. For them, we will provide the challenge statement only.

Recall that you need to compute just the last digit of a Fibonacci number. In order to speed up the computation, take every intermediate result modulo 10.