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The address of this routine is found in the table of addresses. It is called indirectly via fp_calc_2.
This subroutine performs the binary operation 'X$ AND Y' and returns X$ if Y is non-zero and a null string otherwise.
DE Address of the first byte of the number (Y)
str_no 352D EX DE,HL Point HL at Y, DE at X$.
352E CALL TEST_ZERO Test whether Y is zero.
3531 EX DE,HL Swap the pointers back.
3532 RET NC Return with X$ as the 'last value' if Y was non-zero.
3533 PUSH DE Save the pointer to the number.
3534 DEC DE Point to the fifth byte of the string parameters, i.e. length-high.
3535 XOR A Clear the A register.
3536 LD (DE),A Length-high is now set to zero.
3537 DEC DE Point to length-low.
3538 LD (DE),A Length-low is now set to zero.
3539 POP DE Restore the pointer.
353A RET Return with the string parameters being the 'last value'.
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