Task $3[10$ points$]$

Function split$\_$lines$()$ processes the booking lines into booking parts. Strip each line of the $\text{'}$:$\text{'}$

characters, convert its number substrings into integers, and return a $2$D list where each item list

contains the parts for one booking.

The parts at indices $1,2,4,$ and $5$ in a booking list are integers. Also, parts at index $7$ or higher are

integers. If any substrings cannot be converted into an integer, your function should return an error

message as shown below.

Signature: split$\_$lines$($booking$\_$lines$)$

booking$\_$lines is a list containing booking lines represented as strings

The return value is a $2$D list where each item list contains the parts of a booking. If a substring

could not be converted, return the string $"$An int was expected instead of