# [Rockstar](https://codewithrockstar.com/), <s>82</s> <s>73</s> <s>66</s> 57 bytes

    listen to S
    cut S
    O's ""
    while S
    let O be+roll S*2

    say O

[Try it here](https://codewithrockstar.com/online) (Code will need to be pasted in)

    listen to S     :Read input string into variable S
    cut S           :Split into an array
    O's ""          :Initialise O as an empty string
    while S         :While S is not empty
    let O be+       :  Append to O
      roll S        :    Pop the first element from S
      *2            :    Duplicate
                    :End while loop
    say O           :Output O