Ensure get_last_line_of_set_of_lines() function works correctly and is tested properly.

[a-t-0]

In file helper_parsing.sh, one can find get_last_line_of_set_of_lines, however the following test from test_parsing.bats fails on it:

@test "Last line is returned correctly." {
	# TODO: determine why this test does not work.
	#lines=$(printf 'First line\nsecond line \nthird line \nsometoken')
	
	#local actual_result=$(get_last_line_of_set_of_lines "${EXAMPLE_LINES}")
	local actual_result=$(get_last_line_of_set_of_lines $EXAMPLE_LINES)
	local expected_output="sometoken"
		
	assert_equal "$actual_result" "$expected_output"
}