fn sum(a ...int) int{
mut total := 0
for x in a{
total += x
}
return total
pub fn main(){
println(sum())
println(sum(2,1))
println(sum(2,3,5,3))
println(sum(1))
a := [2,3,4]
println(sum(...a))
b := [4,5,6]
println(sum(...b))