repeat method
Returns the given string n times
Implementation
String repeat(int n, {String separator = ''}) {
if (n < 0) ArgumentError('n must be a positive value greater then 0');
var repeatedString = '';
for (var i = 0; i < n; i++) {
if (i > 0) {
repeatedString += separator;
}
repeatedString += this.validate();
}
return repeatedString;
}