first test failed
make test passed
add test one number
make test 2 passed
add test 2 numbers
passed
add test
passed
add test wrong input
add custom delimiter
passed custom define
negative passed
Multi negative failed message match expected.
add test > 1000
passed > 1000
custom undefined length
Revert "custom undefined length"

This reverts commit 0c1a85382c9df5726347158ab9463d20fdc1b49d.
Revert "Revert "custom undefined length""

This reverts commit 60095184d777ad5e09b02f9991aff16445817081.