in old/dekaf-core/src/main/java/org/jetbrains/dekaf/util/Strings.java [99:111]
public static String repeat(@NotNull final String what, @Nullable final String delimiter, int count) {
if (count == 0) return "";
if (count == 1) return what;
StringBuilder b = new StringBuilder((what.length()) + (delimiter == null ? 0 : delimiter.length()) * count);
b.append(what);
for (int i = 1; i < count; i++) {
if (delimiter != null) b.append(delimiter);
b.append(what);
}
return b.toString();
}