Incorrect result sign from `multiply` when one of the inputs is a power of 10

[ZCG-coder]

Describe the bug

When trying to multiply two numbers, where one of them is a power of 10, calc_multiply tries to move decimal places.
However, it did not take the sign of the number into consideration, leading to a wrong result.

To Reproduce

Steps to reproduce the behavior:

1. Run the calc_multiply program with arguments -1.0 and -1.2222222222222.
2. The output is

   Since -1.0 is a power of 10, we can move the decimal places to obtain the result.
   -1.22
   

   , which is of the incorrect sign.

Expected behavior

The sign should be positive.

Screenshots

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OS

• All OSs are affected

Additional context

None yet