Task $4$: Write a function called rearrange that takes a list of integer values as a parameter and that moves to the end of the list all values originally appearing in odd index positions in the list, preserving the relative order of these values. For example :

For the following list of numbers: $14,8,6,3,1,4,2,19,42,9$

The new list produced by rearranging the original list: $14,6,1,2,42,8,3,4,19,9$