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Size: a a a
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val s = "qweaszx"
"${s.substring(0, 3)}-${s.substring(3, 5)}-${s.substring(5)}"
res1: kotlin.String = qwe-as-zx
F
val s = "qweaszx"
"${s.substring(0, 3)}-${s.substring(3, 5)}-${s.substring(5)}"
res1: kotlin.String = qwe-as-zx
StringBuilder(phone).insert(10,"-") .insert(13,"-").toString();
F