5. Merge

Given two sorted arrays, merge them into a single sorted array. Please do not use the bult-in sort functions.

merge([
  1,
  3,
  5
], [
  2,
  4,
  5,
  6,
  8
]);

[
  1,
  2,
  3,
  4,
  5,
  5,
  6,
  8
]