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Scheme Help

By BuckGup
May 17, 2020 in Programming

Go to solution Solved by BuckGup, May 17, 2020

#lang racket

(define (flatten_append list1 list2)
  (if (null? list1) list2
            (flatten (cons (car list1) (append (cdr list1) list2)))))

Here's code that works. You don't need to use pair and can just append the car from list 1 to the cdr of list1 and list2 since con needs two elements.

Posted May 17, 2020

Hello I am trying to learn Scheme and I am making a definition that is a combination of flatten and append with two lists. As of now I have

(define (flatten_append list1 list2)
  (cond ((null? list1 list2) '())
        ((pair? list1 list2) (append (flatten (car list1)) (flatten (cdr list1))
                                     (flatten (car list1)) (flatten (cdr list2))))
        (else (list1 list2))))

But I don't think I can do this as I have two arguments in the null? and pair? part. So would I need to just check null? twice for each list and then the same for pair. Thanks

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Just keeping this here as a backup 9̵̨̢̨̧̧̡̧̡̧̡̧̡̡̢̢̡̢̧̡̢̡̡̢̧̛̛̛̛̛̛̱̖͈̠̝̯̹͉̝̞̩̠̹̺̰̺̲̳͈̞̻̜̫̹̱̗̣͙̻̘͎̲̝͙͍͔̯̲̟̞͚̖̘͉̭̰̣͎͕̼̼̜̼͕͎̣͇͓͓͎̼̺̯͈̤̝͖̩̭͍̣̱̞̬̺̯̼̤̲͎̖̠̟͍̘̭͔̟̗̙̗̗̤̦͍̫̬͔̦̳̗̳͔̞̼̝͍̝͈̻͇̭̠͈̳͍̫̮̥̭͍͔͈̠̹̼̬̰͈̤͚̖̯͍͉͖̥̹̺͕̲̥̤̺̹̹̪̺̺̭͕͓̟̳̹͍̖͎̣̫͓͍͈͕̳̹̙̰͉͙̝̜̠̥̝̲̮̬͕̰̹̳͕̰̲̣̯̫̮͙̹̮͙̮̝̣͇̺̺͇̺̺͈̳̜̣̙̻̣̜̻̦͚̹̩͓͚̖͍̥̟͍͎̦͙̫̜͔̭̥͈̬̝̺̩͙͙͉̻̰̬̗̣͖̦͎̥̜̬̹͓͈͙̤̜̗͔̩̖̳̫̑̀̂̽̈́̈́̿͒̿̋̊͌̾̄̄̒̌͐̽̿̊͑̑̆͗̈̎̄͒̑̋͛̑͑̂͑̀͐̀͑̓͊̇͆̿͑͛͛͆́͆̓̿̇̀̓͑͆͂̓̾̏͊̀̇̍̃́̒̎̀̒̄̓̒̐̑̊̏̌̽̓͂͋̓̐̓͊̌͋̀̐̇̌̓̔͊̈̇́̏͒̋͊̓̆̋̈̀̌̔͆͑̈̐̈̍̀̉̋̈́͊̽͂̿͌͊̆̾̉͐̿̓̄̾͑̈́͗͗̂̂́̇͂̀̈́́̽̈́̓̓͂̽̓̀̄͌̐̔̄̄͒͌̈́̅̉͊̂͒̀̈́̌͂̽̀̑̏̽̀͑̐̐͋̀̀͋̓̅͋͗̍́͗̈́̆̏̇͊̌̏̔̑̐̈́͑̎͑͆̏̎́̑̍̏̒̌̊͘͘̚̕̚̕̕̚̕̚̕̕͜͜͜͜͜͝͝͠͠͝͝͝͝͝͝͝͠͝͝ͅͅͅͅͅͅͅ8̵̨̛̛̛̛̮͍͕̥͉̦̥̱̞̜̫̘̤̖̬͍͇͓̜̻̪̤̣̣̹̑͑̏̈́̐̐́̎͒̔͒̌̑̓̆̓͑̉̈́́͋̌͋͐͛͋̃̍̽̊͗͋͊̂̅͊͑́͋͛̉̏̓͌̾̈́̀͛͊̾͑̌̀̀̌̓̏̑́̄̉̌͂́͛̋͊̄͐͊̈́̀̌̆̎̿̓̔̍̎̀̍̚̕̕͘͘͘̕̚͝͝͠͠͠0̶̡̡̡̢̨̨͕̠̠͉̺̻̯̱̘͇̥͎͖̯͕̖̬̭͔̪̪͎̺̠̤̬̬̤̣̭̣͍̥̱̘̳̣̤͚̭̥͚̦͙̱̦͕̼͖͙͕͇̭͓͉͎̹̣̣͕̜͍͖̳̭͕̼̳̖̩͍͔̱̙̠̝̺̰̦̱̿̄̀͐͜͜ͅͅt̶̡̨̡̨̧̢̧̢̨̧̧̧̧̢̡̨̨̢̨̢̧̢̛̛̛̛̛̠͍̞̮͇̪͉̩̗̗͖̫͉͎͓̮̣̘̫͔̘̬̮̙̯̣͕͓̲̣͓͓̣̹̟͈̱͚̘̼̙̖̖̼̙̜̝͙̣̠̪̲̞̖̠̯̖̠̜̱͉̲̺͙̤̻̦̜͎̙̳̺̭̪̱͓̦̹̺͙̫̖̖̰̣͈͍̜̺̘͕̬̥͇̗̖̺̣̲̫̟̣̜̭̟̱̳̳̖͖͇̹̯̜̹͙̻̥̙͉͕̜͎͕̦͕̱͖͉̜̹̱̦͔͎̲̦͔̖̘̫̻̹̮̗̮̜̰͇̰͔̱͙̞̠͍͉͕̳͍̰̠̗̠̯̜̩͓̭̺̦̲̲͖̯̩̲̣̠͉̦̬͓̠̜̲͍̘͇̳̳͔̼̣͚̙͙͚͕̙̘̣̠͍̟̪̝̲͇͚̦̖͕̰̟̪͖̳̲͉͙̰̭̼̩̟̝̣̝̬̳͎̙̱͒̃̈͊̔͒͗̐̄̌͐͆̍͂̃̈́̾͗̅̐͒̓̆͛̂̾͋̍͂̂̄̇̿̈͌̅̈́̃̾̔̇̇̾̀͊͋̋̌̄͌͆͆̎̓̈́̾̊͊̇̌̔̈́̈́̀̐͊̊̍͑̊̈̓͑̀́̅̀̑̈́̽̃̽͛̇́̐̓̀͆̔̈̀̍̏̆̓̆͒̋́̋̍́̂̉͛̓̓̂̋̎́̒̏̈͋̃̽͆̓̀̔͑̈́̓͌͑̅̽́̐̍̉̑̓̈́͌̋̈́͂̊́͆͂̇̈́̔̃͌̅̈́͌͛̑̐̓̔̈́̀͊͛̐̾͐̔̾̈̃̈̄͑̓̋̇̉̉̚̕̚͘̕̚̚̕̕͜͜͜͜͜͜͜͜͜͜͜͜͜͝͝͝͠͝͝͝͝͝͠ͅͅͅͅͅi̵̢̧̢̧̡̧̢̢̧̢̢̢̡̡̡̧̧̡̡̧̛̛͈̺̲̫͕̞͓̥̖̭̜̫͉̻̗̭̖͔̮̠͇̩̹̱͈̗̭͈̤̠̮͙͇̲͙̰̳̹̲͙̜̟͚͎͓̦̫͚̻̟̰̣̲̺̦̫͓̖̯̝̬͉̯͓͈̫̭̜̱̞̹̪͔̤̜͙͓̗̗̻̟͎͇̺̘̯̲̝̫͚̰̹̫̗̳̣͙̮̱̲͕̺̠͉̫̖̟͖̦͉̟͈̭̣̹̱̖̗̺̘̦̠̯̲͔̘̱̣͙̩̻̰̠͓͙̰̺̠̖̟̗̖͉̞̣̥̝̤̫̫̜͕̻͉̺͚̣̝̥͇̭͎̖̦̙̲͈̲̠̹̼͎͕̩͓̖̥̘̱̜͙̹̝͔̭̣̮̗̞̩̣̬̯̜̻̯̩̮̩̹̻̯̬̖͂̈͂̒̇͗͑̐̌̎̑̽̑̈̈́͑̽́̊͋̿͊͋̅̐̈́͑̇̿̈́̌͌̊̅͂̎͆̏̓͂̈̿̏̃͑̏̓͆̔̋̎̕͘͘͘͜͜͜͜͜͜͜͝͝͠͠ͅͅͅͅͅͅͅͅͅZ̴̧̢̨̢̧̢̢̡̧̢̢̢̨̨̨̡̨̧̢̧̛̛̬̖͈̮̝̭̖͖̗̹̣̼̼̘̘̫̠̭̞͙͔͙̜̠̗̪̠̼̫̻͓̳̟̲̳̻̙̼͇̺͎̘̹̼͔̺̹̬̯̤̮̟͈̭̻͚̣̲͔͙̥͕̣̻̰͈̼̱̺̤̤͉̙̦̩̗͎̞͓̭̞̗͉̳̭̭̺̹̹̮͕̘̪̞̱̥͈̹̳͇̟̹̱̙͚̯̮̳̤͍̪̞̦̳̦͍̲̥̳͇̪̬̰̠͙͕̖̝̫̩̯̱̘͓͎̪͈̤̜͎̱̹̹̱̲̻͎̖̳͚̭̪̦̗̬͍̯̘̣̩̬͖̝̹̣̗̭͖̜͕̼̼̲̭͕͔̩͓̞̝͓͍̗̙̯͔̯̞̝̳̜̜͉̖̩͇̩̘̪̥̱͓̭͎͖̱̙̩̜͎̙͉̟͎͔̝̥͕͍͓̹̮̦̫͚̠̯͓̱͖͔͓̤͉̠͙̋͐̀͌̈́͆̾͆̑̔͂͒̀̊̀͋͑̂͊̅͐̿́̈́̐̀̏̋̃̄͆͒̈́̿̎́́̈̀̀͌̔͋͊̊̉̿͗͊͑̔͐̇͆͛̂̐͊̉̄̈́̄̐͂͂͒͑͗̓͑̓̾̑͋̒͐͑̾͂̎̋̃̽̂̅̇̿̍̈́́̄̍͂͑̏̐̾̎̆̉̾͂̽̈̆̔́͋͗̓̑̕͘̕͘͜͜͜͜͜͝͝͝͝͠͠͝ͅo̶̪͆́̀͂̂́̄̅͂̿͛̈́̿͊͗́͘͝t̴̡̨̧̨̧̡̧̨̡̢̧̢̡̨̛̪͈̣̭̺̱̪̹̺̣̬̖̣̻͈̞̙͇̩̻̫͈̝̭̟͎̻̟̻̝̱͔̝̼͍̞̼̣̘̤̯͓͉̖̠̤͔̜̙͚͓̻͓̬͓̻̜̯̱̖̳̱̗̠̝̥̩͓̗̪̙͓̖̠͎̗͎̱̮̯̮͙̩̫̹̹̖͙̙͖̻͈̙̻͇͔̙̣̱͔̜̣̭̱͈͕̠̹͙̹͇̻̼͎͍̥̘͙̘̤̜͎̟͖̹̦̺̤͍̣̼̻̱̲͎̗̹͉͙̪̞̻̹͚̰̻͈͈͊̈́̽̀̎̃̊́̈́̏̃̍̉̇̑̂̇̏̀͊̑̓͛̽͋̈́͆́̊͊̍͌̈́̓͊̌̿̂̾̐͑̓̀́͒̃̋̓͆̇̀͊̆͗̂͑͐̀͗̅̆͘̕͘̕̕͜͜͝͝͝͝͝͝͝ͅͅͅͅͅͅͅͅͅḁ̶̢̡̨̧̡̡̨̨̧̨̡̡̢̧̨̡̡̛̛̛͍̱̳͚͕̩͍̺̪̻̫̙͈̬͙̖͙̬͍̬̟̣̝̲̼̜̼̺͎̥̮̝͙̪̘̙̻͖͇͚͙̣̬̖̲̲̥̯̦̗̰̙̗̪̞̗̩̻̪̤̣̜̳̩̦̻͓̞̙͍͙̫̩̹̥͚̻̦̗̰̲̙̫̬̱̺̞̟̻͓̞͚̦̘̝̤͎̤̜̜̥̗̱͈̣̻̰̮̼̙͚͚̠͚̲̤͔̰̭̙̳͍̭͎̙͚͍̟̺͎̝͓̹̰̟͈͈̖̺͙̩̯͔̙̭̟̞̟̼̮̦̜̳͕̞̼͈̜͍̮͕̜͚̝̦̞̥̜̥̗̠̦͇͖̳͈̜̮̣͚̲̟͙̎̈́́͊̔̑̽̅͐͐͆̀͐́̓̅̈͑͑̍̿̏́͆͌̋̌̃̒̽̀̋̀̃̏̌́͂̿̃̎̐͊̒̀̊̅͒̎͆̿̈́̑̐̒̀̈́̓̾͋͆̇̋͒̎̈̄̓̂͊̆͂̈́̒̎͐̇̍̆̋̅̿̔͒̄̇̂̋̈́͆̎̔̇͊̊̈́̔̏͋́̀͂̈́̊͋͂̍̾̓͛̇̔̚͘̚̕̚͘͘̕̕̕̚͘͘̚̕̚̕͜͜͜͝͝͝͝͝͝͝͝ͅͅͅͅͅç̵̧̢̨̢̢̢̧̧̡̨̡̢̧̧̧̨̡̡̨̨̢̢̢̧̨̢̨̢̛̛͉̗̠͇̹̖̝͕͚͎̟̻͓̳̰̻̺̞̣͚̤͙͍͇̗̼͖͔͕͙͖̺͙̖̹̘̘̺͓̜͍̣̰̗̖̺̗̪̘̯̘͚̲͚̲̬̞̹̹͕̭͔̳̘̝̬͉̗̪͉͕̞̫͔̭̭̜͉͔̬̫͙̖̙͚͔͙͚͍̲̘͚̪̗̞̣̞̲͎͔͖̺͍͎̝͎͍̣͍̩̟͈͕̗͉̪̯͉͎͖͍̖͎̖̯̲̘̦̟̭͍͚͓͈͙̬͖̘̱̝̜̘̹̩̝̥̜͎̬͓̬͙͍͇͚̟̫͇̬̲̥̘̞̘̟̘̝̫͈̙̻͇͎̣̪̪̠̲͓͉͙͚̭̪͇̯̠̯̠͖̞̜͓̲͎͇̼̱̦͍͉͈͕͉̗̟̖̗̱̭͚͎̘͓̬͍̱͍̖̯̜̗̹̰̲̩̪͍̞̜̫̩̠͔̻̫͍͇͕̰̰̘͚͈̠̻̮͊̐̿̏̐̀̇̑̐̈͛͑͑̍̑̔̃̈́̓̈́̇̐͑̐̊̆͂̀̏͛̊̔̍̽͗͋̊̍̓̈́̏̅͌̀̽́̑͒͒̓͗̈́̎͌͂̕̚͘͘͜͜͜͜͜͠͝͝͝͝ͅͅͅͅͅͅͅS̵̡̡̧̧̨̨̡̢̡̡̡̡̧̧̡̧̢̫̯͔̼̲͉͙̱̮̭̗͖̯̤͙̜͚̰̮̝͚̥̜̞̠̤̺̝͇̻̱͙̩̲̺͍̳̤̺̖̝̳̪̻̗̮̪̖̺̹̭͍͇̗̝̱̻̳̝̖̝͎̙͉̞̱̯̙̜͇̯̻̞̱̭̗͉̰̮̞͍̫̺͙͎̙̞̯̟͓͉̹̲͖͎̼̫̩̱͇̲͓̪͉̺̞̻͎̤̥̭̺̘̻̥͇̤̖̰̘̭̳̫̙̤̻͇̪̦̭̱͎̥̟͖͕̣̤̩̟̲̭̹̦̹̣͖̖͒̈́̈́̓͗̈̄͂̈́̅̐̐̿̎̂͗̎̿̕͘͜͜͜͜͝͝ͅͅt̸̡̡̧̧̨̡̢̛̥̥̭͍̗͈̩͕͔͔̞̟͍̭͇̙̺̤͚͎͈͎͕̱͈̦͍͔͓̬͚̗̰̦͓̭̰̭̎̀̂̈́̓̒̈́̈́̂̄̋́̇̂͐͒̋̋̉͐̉̏̇͋̓̈́͐̾͋̒͒͐̊̊̀̄͆̄͆̑͆̇̊̓̚̚̕̚̕͜͠͝͝ͅͅơ̵̡̨̡̡̡̨̛̺͕̼͔̼̪̳͖͓̠̘̘̳̼͚͙͙͚̰͚͚͖̥̦̥̘̖̜̰͔̠͕̦͎̞̮͚͕͍̤̠̦͍̥̝̰̖̳̫̮̪͇̤̱̜͙͔̯͙̙̼͇̹̥̜͈̲̺̝̻̮̬̼̫̞̗̣̪̱͓̺̜̠͇͚͓̳̹̥̳̠͍̫͈̟͈̘̯̬̞͔̝͍͍̥̒̐͗͒͂͆̑̀̿̏́̀͑͗̐́̀̾̓́̌̇̒̈́̌̓͐̃̈́̒̂̀̾͂̊̀̂͐̃̄̓̔̽̒̈́̇̓͌̇̂̆̒̏̊̋͊͛͌̊̇̒̅͌̄̎̔̈́͊́̽̋̈̇̈́́͊̅͂̎̃͌͊͛͂̄̽̈́̿͐̉̽̿́́̉͆̈́̒́̂̾̄̇̌̒̈̅̍̿̐͑̓͊̈́̈̋̈́̉̍̋̊̈̀̈́̾̿̌̀̈́͌̑̍́̋̒̀̂̈́́̾̏̐̅̈̑͗͐̈͂̄̾̄̈́̍̉͑͛͗͋̈́̃̄̊́́͐̀̀̽̇̓̄̓̃͋͋̂̽̔̀̎͌̈́̈́̑̓̔̀̓͐͛͆̿̋͑͛̈́͂̅̋̅͆͗̇́̀̒́̏͒̐̍͂̓͐͐̇̂̉̑̊͑̉̋̍͊̄̀͂̎͒̔͊̃̏̕̚̕̕͘͘͘̚͘̚͘̕͘̚͘̚̚̚̕͘͜͜͜͝͝͠͠͝͝͠͠͝͝͝͝͝͝͝͝͝ͅͅͅc̴̨̡̢̢̢̡̡̢̛̛̛̻͇̝̣͉͚͎͕̻̦͖̤̖͇̪̩̤̻̭̮̙̰̖̰̳̪̱̹̳̬͖̣͙̼̙̰̻̘͇͚̺̗̩̫̞̳̼̤͔͍͉̟͕̯̺͈̤̰̹̍̋́͆̾̆̊͆͋̀͑͒̄̿̄̀̂͋̊͆́͑̑̽͊̓́̔̽̌͊̄͑͒͐̑͗̿̃̀̓̅́̿͗̈́͌̋̀̏̂͌̓́̇̀͒͋̌̌̅͋͌̆͐̀̔̒͐̊̇̿̽̀̈́̃̒̋̀̈́̃̏̂̊͗̑̊̈̇̀̌͐̈́̉̂̏͊̄͐̈̽͒̏̒̓́̌̓̅́̓̃͐͊͒̄͑̒͌̍̈́̕͘̚͘̕͘̚̕͜͝͠͝͝͝ͅǩ̴̢̢̢̧̨̢̢̢̨̨̨̢̢̢̨̧̨̡̡̢̛̛̛̛̛̛̛̜̥̩̙͕̮̪̻͈̘̯̼̰̜͚̰͖̬̳͖̣̭̼͔̲͉̭̺͚̺̟͉̝̱̲͎͉̙̥̤͚͙̬̪̜̺͙͍̱̞̭̬̩̖̤̹̤̺̦͈̰̗̰͍͇̱̤̬̬͙̙̲̙̜͖͓̙̟̙̯̪͍̺̥͔͕̝̳̹̻͇̠̣͈̰̦͓͕̩͇͈͇̖͙͍̰̲̤̞͎̟̝̝͈͖͔͖̦̮̗̬̞̞̜̬̠̹̣̣̲̮̞̤̜̤̲̙͔͕̯͔͍̤͕̣͔͙̪̫̝̣̰̬̬̭̞͔̦̟̥̣̻͉͈̮̥̦̮̦͕̤͇̺͆͆̈͗̄̀̌̔̈́̈̉̾̊̐̆̂͛̀̋́̏̀̿͒̓̈́̈́͂̽̾͗͊̋̐̓̓̀̃̊̊͑̓̈̎̇͑̆̂̉̾̾̑͊̉̃́̑͌̀̌̐̅̃̿̆̎̈́̀̒́͛̓̀̊́̋͛͒͊̆̀̃̊͋̋̾̇̒̋͂̏͗͆̂̔́̐̀́͗̅̈̋̂̎̒͊̌̉̈̈́͌̈́̔̾̊̎́͐͒̋̽̽́̾̿̚̕͘͘̚̕̕̕̚̚̕̚̕͘͜͜͜͝͠͝͝͝͝͝͝͝͝ͅͅͅͅͅͅB̸̢̧̨̡̢̧̨̡̡̨̡̨̡̡̡̢̨̢̨̛̛̛̛̛̛͉̞͚̰̭̲͈͎͕͈̦͍͈̮̪̤̻̻͉̫̱͔̞̫̦̰͈̗̯̜̩̪̲̻̖̳͖̦͎͔̮̺̬̬̼̦̠̪̤͙͍͓̜̥̙̖̫̻̜͍̻̙̖̜̹͔̗̪̜̖̼̞̣̠̫͉̯̮̤͈͎̝̪͎͇͙̦̥͙̳̫̰̪̣̱̘̤̭̱͍̦͔̖͎̺̝̰̦̱̣͙̙̤͚̲͔̘̱̜̻͔̥̻͖̭͔̜͉̺͕͙͖̜͉͕̤͚̠̩̮̟͚̗͈͙̟̞̮̬̺̻̞͔̥͉͍̦̤͓̦̻̦̯̟̰̭̝̘̩̖̝͔̳͉̗̖̱̩̩̟͙͙͛̀͐̈́̂̇͛̅̒̉̏̈́̿͐́̏̃̏̓̌̽͐̈́͛̍͗͆͛̋̔̉͂̔̂̓̌͌͋̂͆̉͑̊̎́̈́̈̂͆͑́̃̍̇̿̅̾́́̿̅̾̆̅̈́̈̓͒͌͛̃͆̋͂̏̓̅̀͂̽̂̈̈́̎̾̐͋͑̅̍̈́̑̅̄͆̓̾̈́͐̎̊͐̌̌̓͊̊̔̈́̃͗̓͊͐̌͆̓͗̓̓̾̂̽͊͗́́́̽͊͆͋͊̀̑̿̔͒̏̈́́̏͆̈́͋̒͗͂̄̇̒͐̃͑̅̍͒̎̈́̌̋́̓͂̀̇͛̋͊͆̈́̋́̍̃͒̆̕̚̚̕̕̕͘̕̚̚͘̕͜͜͜͜͝͠͠͝͠͝͝͝͝͠͝͝͝͝ͅͅͅͅͅI̵̡̢̧̨̡̢̨̡̡̢̡̧̡̢̢̢̡̢̛̛͕͎͕̩̠̹̩̺̣̳̱͈̻̮̺̟̘̩̻̫͖̟͓̩̜̙͓͇̙̱̭̰̻̫̥̗̠͍͍͚̞̘̫͉̬̫̖̖̦͖͉̖̩̩̖̤̺̥̻̝͈͎̻͓̟̹͍̲͚͙̹̟̟̯͚̳̟͕̮̻̟͈͇̩̝̼̭̯͚͕̬͇̲̲̯̰̖̙̣̝͇̠̞̙͖͎̮̬̳̥̣̺̰͔̳̳̝̩̤̦̳̞̰̩̫̟͚̱̪̘͕̫̼͉̹̹̟̮̱̤̜͚̝̠̤̖̮̯̳͖̗̹̞̜̹̭̿̏͋̒͆̔̄̃̾̓͛̾̌́̅̂͆̔͌͆͋̔̾́̈̇̐̄̑̓̂̾́̄̿̓̅̆͌̉̎̏̄͛̉͆̓̎͒͘̕̕͜͜͜͜͜͜͜͝͠ͅͅƠ̷̛̛̛̛̛͋͂̅̈́̍͂̽͗̾͒̇̇̒͐̍̽͊́̑̇̑̾̉̓̈̾͒̍̌̅̒̾̈́̆͌̌̾̎̽̐̅̏́̈̔͛̀̋̃͊̒̓͗͒̑͒̃͂̌̄̇̑̇͛̆̾͛̒̇̍̒̓̀̈́̄̐͂̍͊͗̎̔͌͛̂̏̉̊̎͗͊͒̂̈̽̊́̔̊̃͑̈́̑̌̋̓̅̔́́͒̄̈́̈̂͐̈̅̈̓͌̓͊́̆͌̉͐̊̉͛̓̏̓̅̈́̕̕̕̚͘͘͘̚̕͝͝͝͠͝͝͝͝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Posted May 17, 2020

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Solution

#lang racket

(define (flatten_append list1 list2)
  (if (null? list1) list2
            (flatten (cons (car list1) (append (cdr list1) list2)))))

Here's code that works. You don't need to use pair and can just append the car from list 1 to the cdr of list1 and list2 since con needs two elements.