Write a function that takes an array of length n and returns an n x n square matrix as an output, where the first row is the original array, and every subsequent row is the row above it shifted one index to the left. For example, [1 2 3 4 5] as an input would result in

[1 2 3 4 5;

2 3 4 5 1;

3 4 5 1 2;

4 5 1 2 3;

5 1 2 3 4]

***As an output. Do not use the built in function circshift.