Clarify the 48 magic number
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@ -4,7 +4,7 @@ import ./common
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type SubmarineCommand = enum
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Forward, Up, Down
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proc parseArg(c: char): int = c.int() - 48
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proc parseArg(c: char): int = c.int() - int('0')
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proc parseSubmarineCommand(l: string): (SubmarineCommand, int) =
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case l[0]:
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