Step 1: Divide the number into separate digits:
23302 => 2 3 3 0 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 3 = 1
3 to 3 = 0
3 to 0 = 3
0 to 2 = 2
2 to 2 = 0
Step 3: Combine the filters to a string:
1 0 3 2 0 = 10320