function e008(N)
    return max_substring(long_number,N)
end

function solution008()
    N = 13
    answer = e008(N)
    println("The answer to problem 008 is $answer")
end

function max_substring(aString, substr_length)
    max::Int128 = 0
    for i = 1:length(aString)-substr_length+1
        substr = aString[i:i+substr_length-1]
        number::Int128 = 1
        for num in substr
            number *= parse(Int128,num)
        end
        if number > max
            max = number
        end
    end
    return max
end

const long_number = replace("73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450", "\n" => "")