Step 1: Divide the number into separate digits:
88944 => 8 8 9 4 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 8 = 0
8 to 9 = 1
9 to 4 = 5
4 to 4 = 0
4 to 8 = 4
Step 3: Combine the filters to a string:
0 1 5 0 4 = 01504