stp_number.dir@_karatsuba.c.dir@_STP_Number_mul_abs_karatsuba

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  Function: _STP_Number_mul_abs_karatsuba

  Summary:  Multiplies lhs and rhs using Karatsuba algorithm, returning result in out.

  Args:     const STP_Number* lhs
              multiplicand.
            const STP_Number* rhs
              multiplier.
            STP_Number* out
              product output.

  Returns:  int
              1 if successful, 0 if fail

  Requires: * lhs and rhs are not NULL
            * out is initialized
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