Need Jass Help

For my map, I'm trying to make a password system. I want to make the password shorter by converting the password to base 62, but my function doesn't work and I need help on it.

function I2B62 takes integer WhichInteger returns string

local string ConvertedNumber = null
local integer NumToConvert = WhichInteger
local integer Place = 1
local integer IntTemp = 0

loop
exitwhen (NumToConvert == 0)
loop
exitwhen NumToConvert < Place
set Place = Place * 62
endloop

set IntTemp = NumToConvert / Place
set ConvertedNumber = ConvertedNumber + ByteToB62(IntTemp)
set Place = Place * IntTemp
set NumToConvert = NumToConvert - Place
endloop

return ConvertedNumber
endfunction

and this is ByteToB62

function ByteToB62 takes integer b returns string
local string charmap = " 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMN
OPQRSTUVWXYZ"
local integer c1 = ModuloInteger( b, 62 )
local integer c2 = b / 62
return SubString( charmap, c2, c2 + 1 ) + SubString( charmap, c1, c1 + 1 )
endfunction

Thanks in advance