public final class ExtensionFunctionKt {
    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
    public synthetic static method sum$default(p0: java.lang.String, p1: java.lang.String, p2: int, p3: java.lang.Object): java.lang.String
    public final static @org.jetbrains.annotations.NotNull method sum(@org.jetbrains.annotations.NotNull p0: java.lang.String, @org.jetbrains.annotations.NotNull p1: java.lang.String): java.lang.String
}