Add 3 zero after every n element in an array

Hi, I have an array that has 50 elements ( 0 and 1) . I would like to add 3 zero after every 5 elements . As below for the first 10 elements

10101010111111101001 should become  10101010110001111101001000

could you please help me on this one ? I would greatly appreciate if youd attach the code for it

thanks