Assume ruby does not have a flatten method and you need to flatten an Array. Write a function that would take a nested array and return a single flattened sorted array. To make this more interesting, do not use any of the inbuild collection method (merge, concat, map etc.)
Input
[1, 2, 3, [4, 6, [7, 8]], 5, 9, 10]
output
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Example
def make_flat(array)
# write your code here
end
puts make_flat([1, 2, 3, [4, 6, [7, 8]], 5, 9, 10])
# output : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10