Reimplement To Squares with pattern matching.

Code to Implement

file:	src/main/sml/warmup_squares_using_hof/squares_using_hof.sml
functions:	to_squares

fun to_squares(xs : int list) : int list =
	raise Fail "NotYetImplemented"

Test

source folder:	src/test/sml/warmup_squares_using_hof
how to run with CM.make verbosity off:	sml -Ccm.verbose=false run_squares_using_hof_testing.sml
how to run with CM.make verbosity on:	sml run_squares_using_hof_testing.sml

note: ensure that you have removed all printing to receive credit for any assignment.