Step 1: Divide the number into separate digits:
44948 => 4 4 9 4 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 4 = 0
4 to 9 = 5
9 to 4 = 5
4 to 8 = 4
8 to 4 = 4
Step 3: Combine the filters to a string:
0 5 5 4 4 = 05544