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package list
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// Add adds a string to the list if it does not exist yet.
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func Add(list []string, s string) []string {
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if s == "" {
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return list
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} else if len(list) == 0 {
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return []string{s}
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} else if Contains(list, s) {
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return list
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}
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return append(list, s)
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}
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