code: public Period multipliedBy(int scalar) {
          if (this == ZERO || scalar == 1) {
              return this;
          }
          return create(
                  Jdk8Methods.safeMultiply(years, scalar),
                  Jdk8Methods.safeMultiply(months, scalar),
                  Jdk8Methods.safeMultiply(days, scalar));
      }
docs: Returns a new instance with each element in this period multiplied
  by the specified scalar.
  <p>
  This simply multiplies each field, years, months, days and normalized time,
  by the scalar. No normalization is performed.
  
  @param scalar  the scalar to multiply by, not null
  @return a {@code Period} based on this period with the amounts multiplied by the scalar, not null
  @throws ArithmeticException if numeric overflow occurs