45 bytes plus two for the -lF flags (-M5.01 is free): perl -lF -M5.01 script.pl
/#+/;{unshift@F,pop@F;++$i<"$$'"&&redo}say@F  Explanation: • -lF reads the input, removes the trailing newline, splits up the remainder into characters, and puts that split into the array @F. • $"='' makes sure that when we stringify an array it has no spaces in it.
• /#+/ finds #s in the input string and sets $ equal to the stuff before it and $' equal to the stuff after it. $'$ is thus the number of times to rotate the array.
• Now comes a loop: We increment $i (which starts at 0) and test against $'$ (the number of times to rotate); if we haven't reached $'\$ yet, we redo the loop. What does the loop do? Simple: it rotates the array (pops the last element and unshift`s it onto the beginning).