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Spot the error

This Swift code contains one error – can you select the line that is incorrect?

Tip: You should mentally run the code from top to bottom, meaning that if line 3 says an integer should be returned and line 10 tries to return a string, line 10 is the wrong one.

function divideLoot(people: Int, fairly: Bool) -> String {
    var returnValue: String = "We're going to split this...\n"
    if fairly {
        returnValue += "Everyone gets 1/\(people)"
    } else {
        returnValue += "I get half because I deserve it.\n"
        returnValue += "Everyone else can split the remainder."
    }
    return returnValue
}
print(divideLoot(people: 3, fairly: false))
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