Created else section, i.e. part contains no ":"
Made condition; checks if part contains ":"

Prints “Oh no!” if the condition is met.
Got it to handle range of 1:3, output 1, 2, 3.
Will handle a range 1:5
array contains un-processed strings as well :(

1,3:5,10:11
1,3:5,10:11
Oh no!
Oh no!
1
3:5
10:11
1
3
4
5
10
11
null
BUILD SUCCESSFUL (total time: 0 seconds)
Array contains processed and unprocessed strings