code: private static int minimum(int a, int b, int c) {
        int minValue;
        minValue = a;
        if (b < minValue) {
          minValue = b;
        }
        if (c < minValue) {
          minValue = c;
        }
        return minValue;
    }
docs: Get mininum of three values.
  @param a number a
  @param b number b
  @param c number c
  @return the minimum