using fixtures instead of inline data; adding more unit tests that have data in a different order
initial implementation

assumed dictionary has sorted items; east is always first and west is
always second
code review comments
finalized code review comments (\o/)

1.implemented the two functions to get the minimum time (took into
account the east/west train an what if the first train isn't the one
that's going to arrive in less time)
2.what can be improved: make code prettier
3.made the functions return None if no data was returned from the jsons
4.didn't consider the dottet part of the orange line