Complete the implementation for the recursive function repeat$\_$digits, which takes a positive integer num and returns another integer that is identical to num but with each digit repeated.

Fun Fact: We can compose and decompose numbers into hundreds, tens and ones to represent them as a sum, for example: $234=200+30+4=2*100+3*10+4.$ Use this fact to complete this exercise

def repeat$\_$digits$($num$)$:

$"""$

$>>>$ repeat$\_$digits$(1234)$

$11223344$

$>>>$ repeat$\_$digits$(5)$

$55$

$>>>$ repeat$\_$digits$(96)$

$9966$

$"""$

if

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:

return $($num $*10)+$ num

last$\_$digit $=$

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rest $=$

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return $($

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$*$

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$)+($

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$+$ last$\_$digit$)$