code: public static BigDecimal mantissa(BigDecimal value) {
  		int exponent = exponent(value);
  		if (exponent == 0) {
  			return value;
  		}
  
  		return value.movePointLeft(exponent);
  	}
docs: Returns the mantissa of the specified {@link BigDecimal} written as <em>mantissa * 10<sup>exponent</sup></em>.
  
  <p>The mantissa is defined as having exactly 1 digit before the decimal point.</p>
  
  @param value the {@link BigDecimal}
  @return the mantissa
  @see #exponent(BigDecimal)