Write a function to_secs that converts hours, minutes and seconds to a total number of seconds. Here are some tests that should pass:

test(to_secs(2, 30, 10) == 9010)

test(to_secs(2, 0, 0) == 7200)

test(to_secs(0, 2, 0) == 120)

test(to_secs(0, 0, 42) == 42)

test(to_secs(0, -10, 10) == -590)