Coins change

[AnnaShliapkina]

Please find my new pull request. All tests are passed Added README(with parameters)

• [ ] PR's title includes the challenge's name and language
• [x] PR has short and clear description of the challenge
• [x] PR has appropriate labels and milestones for easy identification
• [x] PR it is assigned to the owner
• [x] reviewers are assigned
• [x] the PR contributes only one focused change
• [x] the branch is up to date with main/master
• [x] the code works when pulled and run locally
• [x] all conflicts are resolved (if any)
• [x] It is linked to an issue in the appropriate column of the project board
• [x] feedback is addressed (if any, and if it is appropriate feedback.)

README Documentation

• [x] The solution is documented in /src/README.md
• [x] The markdown source is formatted
• [x] Spelling and grammar is correct in all text
• [x] The markdown looks correct when you preview the file
• [x] All links and images work
• [x] The README documents the solution's behavior, strategy(ies) and implementation(s)
• [x] There are use cases in code blocks to illustrate the function's behavior

Python Files

• [x] There is a module header
• [x] There is a module docstring
• [x] File names are in snake_case
• [x] Test files are named test_<module_name>.py

Function Docstring

• [x] Behavior description
• [x] Parameter description
• [x] Return value description
• [ ] Include any assumptions
• [x] Include 3 or more (passing!) doctests
• [ ] Include 1-2 use cases (if necessary)

Function Implementation

• [x] The solution is not is not copied from djeada
• [x] The code is auto-formatted
• [x] The code has no (reasonable) linting mistakes
• [x] Variables are named with snake_case
• [x] The function has a clear and helpful name
• [x] The file's name matches the function name
• [x] The code follows the strategy as simply as possible
• [x] Variable names are clear and helpful
• [x] Comments explain the strategy (if necessary)
• [x] There are type annotations
• [x] (challenge) The code includes defensive assertions

Unit Test Suite

• [x] The test class has a helpful name in PascalCase
• [x] The test class has a docstring
• Each unit test has
  • [x] A helpful name
  • [x] A clear docstring
  • [x] Only one assertion
• [x] All tests pass
• [x] There are tests for defensive assertions
• [x] There are tests for boundary cases
• [ ] Test suite includes black-box and glass-box tests

[YaninaChukanova]

The code works cleanly, the task is completed.

[DmytroLyt]

Need some improvement.

• PR's title includes the challenge's name and language (Yours doesn`t include language)
• PR has appropriate labels and milestones for easy identification (Yours doesn`t have labels, milestones, and project not chosen)
• There is a module header (need include)
• There is a module docstring (need include)
• Return value description (need include)
• The test class has a docstring (Yours doesn`t have any docstrings)