#74
Filter Perfect Squares
 

Difficulty:N/A
Topics:medium


Given a string of comma separated integers, write a function which returns a new comma separated string that only contains the numbers which are perfect squares.
test not run
(= (__ "4,5,6,7,8,9") "4,9")
test not run
(= (__ "15,16,25,36,37") "16,25,36")


Code which fills in the blank: