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func removeDuplicates(S string) string {
    stack := make([]rune, 0, 10)
    for _, s := range S {
        if len(stack) != 0 && s == stack[len(stack)-1] {
            stack = stack[:len(stack)-1] // pop
        } else {
            stack = append(stack, s)
        }
    }
    return string(stack)
    
}