PLEASE HELP ME FIX THESE CODE FOR THIS # the encryption of block $\text{'}b\text{'}$ as a string

encrypted$\_$block $=$ 'None'

if len$($encrypted$\_$block$)<mtext\; id="EditorElement\_81884"></mtext><mn\; id="EditorElement\_81885">1</mn>$ :

# FIXME: If the encrypted block contains less digits

# than the block size L$,$ prepend the block with enough

# $0\text{'}$s so that the numeric value of the block

# remains the same, but the new block size is $L,$

# e$.$g$.$ if $L=4$ and encrypted block is $\text{'}451\text{'}$ then prepend

# one $0$ to obtain $\text{'}6451\text{'}$

encrypted$\_$block $=$ None

# FIXME: Append the encrypted block to the cipher

cipher $+=$ 'None'

return cipher