Write a space at the end of visible_sleep.
Write a space at the end of visible_sleep.

This overwrites the last digit when the number of digits decreases.
Otherwise you get output like this:

sleep 14
sleep 13
sleep 12
sleep 11
sleep 10
sleep 90
sleep 80
sleep 70
...

arlolra/flashproxy,glamrock/flashproxy,infinity0/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,infinity0/flashproxy,glamrock/flashproxy,glamrock/flashproxy,glamrock/flashproxy,arlolra/flashproxy,infinity0/flashproxy,infinity0/flashproxy,glamrock/flashproxy,infinity0/flashproxy,arlolra/flashproxy,infinity0/flashproxy,glamrock/flashproxy