Very hard to understand the problem statement. Not very hard to solve.

Explanation:

• For each, track each digit char (arr[0])
• For each string char (arr[1]) , associate it with the digit (arr[0]) in the tracker, keeping them in order
• But, if point is less than midpoint or arr, insert "-" instead

No Idea how to do it in C though. Can't even index into the correct part of the array without a seg fault occuring.