title: Scheme merge two lists into one
body: <p>how to design a function that merge two lists into one list.
  the first element of first list will be the first element of the new list and the first element of the second list will be the second element of the new list
  (a,b,c,d,e,f) (g,h,i) will be (a,g,b,h,c,i,d,e,f,)</p>