Using a loop invariant prove whether the solution is correct or not. Provide any

Using a loop invariant prove whether the solution is correct or not. Provide any corrections,
if needed, to result in a correct final version of the algorithm.
INPUT: Given a list L = {x1, . . . , xm, y1, . . . , ym} of length 2n ≥ 2 containing arbitrary symbols from some
alphabet x, y ∈ Σ. (NOTE: Σ is often used as a symbol to represent an arbitrary alphabet.)
OUTPUT: A list of weaved values {y1, x1, . . . , ym, xm}.