Write a function that takes as input parameters an array of characters and a length field. The function will create a square matrix from the array by first determining the largest square matrix that will hold as many numbers as possible yet not have any blank spaces. So, for instance, if the arrays length was 22, the largest square matrix would be 4x4. If the arrays length was 37, the square matrix would be 6x6.

Then create the square matrix and read the numbers from the array into the matrix (starting with arr[0] onwards).

Then print the diagonal of the matrix.