you must decide how the input variable is named: 'n', 'nx' or 'x'!! :-/
I cleaned things up a little.
Hard-coded solutions based on look-up tables for F_n or (F_n)², such as Solution 1506329, should be banned and failed by the Test Suite.
I do not undertand the problem. If you provide the fibonacci sequence, there is nothing to do.
Extract leading non-zero digit
Make one big string out of two smaller strings
Back to basics 10 - Max Float
07 - Common functions and indexing 2
Determine the length of a string of characters
Find the square of the sum of the digits of a number
Concatenate two strings
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