Creates a new string by concatenating this string with itself a number of times.
The result of str * n is equivalent to str + str + ...(n times)... + str.
Returns an empty string if times is zero or negative.
String operator *(int times);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-core/String/operator_multiply.html