My java solution. Not all tests pass and i don't understand why. If i test them by hand they pass, but sending solution makes them not pass (for example test 2)

class Result {

/*
 * Complete the 'timeInWords' function below.
 *
 * The function is expected to return a STRING.
 * The function accepts following parameters:
 *  1. INTEGER h
 *  2. INTEGER m
 */

 private static final String[] NUMBERS = {
    "", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten",
    "eleven", "twelve", "thirteen", "fourteen", "quarter", "sixteen", "seventeen",
    "eighteen", "nineteen", "twenty", "twenty one", "twenty two", "twenty three",
    "twenty four", "twenty five", "twenty six", "twenty seven", "twenty eight",
    "twenty nine", "half"
};

public static String timeInWords(int h, int m) {
// Write your code here
StringBuilder b = new StringBuilder();
if(m > 0 && m <= 30) {
    System.out.print(NUMBERS[m] + " past " + NUMBERS[h]);
    b.append(NUMBERS[m] + " past " + NUMBERS[h]);
} else if(m > 30) {
    System.out.print(NUMBERS[60-m] + " minutes to " + NUMBERS[h+1]);
    b.append(NUMBERS[60-m] + " minutes to " + NUMBERS[h+1]);
} else {
    System.out.print(NUMBERS[h] + " o' clock");
    b.append(NUMBERS[h] + " o' clock");
}
return b.toString();
}

}

Not all