feat: add multiply.rs

[mengfansheng-git]

Given two non-negative integers num1 and num2 expressed as strings, returns the product of num1 and num2, which is also expressed as a string.
Note: You cannot use any of the built-in BigInteger libraries or directly convert the input to an integer.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.96%. Comparing base (bba0b0d) to head (78623af).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #716   +/-   ##
=======================================
  Coverage   94.95%   94.96%           
=======================================
  Files         302      303    +1     
  Lines       22527    22563   +36     
=======================================
+ Hits        21390    21426   +36     
  Misses       1137     1137           

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[mengfansheng-git]

This clippy error should be a machine issue？

[vil02]

This clippy error should be a machine issue

I think these errors are related to the recent update of the clippy. I will make a suitable fix in the evening.

[mengfansheng-git]

This clippy error should be a machine issue

I think these errors are related to the recent update of the clippy. I will make a suitable fix in the evening.

ok

[vil02]

When you will update/rebase your branch, the CI should pass.

[vil02]

multiply("03", "2") returns "06".

[mengfansheng-git]

multiply("03", "2")返回"06"。

multiply2: ("03", "2", "06")
multiply3: ("03", "02", "006")
It currently returns. Do I need to add it to test?

[vil02]

multiply("03", "2")返回"06"。

multiply2: ("03", "2", "06") multiply3: ("03", "02", "006") It currently returns. Do I need to add it to test?

I would suggest to exclude inputs like "03", "003" or "X3", simply because they are not properly formatted numbers.

[mengfansheng-git]

multiply("03", "2")返回"06"。

multiply2: ("03", "2", "06") multiply3: ("03", "02", "006") It currently returns. Do I need to add it to test?

I would suggest to exclude inputs like "03", "003" or "X3", simply because they are not properly formatted numbers.

I'll add a string formatting judgment