in src/main/java/org/apache/datasketches/memory/internal/Util.java [62:71]
public static final String characterPad(final String s, final int fieldLength, final char padChar, final boolean postpend) {
final int sLen = s.length();
if (sLen < fieldLength) {
final char[] cArr = new char[fieldLength - sLen];
fill(cArr, padChar);
final String addstr = String.valueOf(cArr);
return (postpend) ? s.concat(addstr) : addstr.concat(s);
}
return s;
}