fix: Double / on Running script #293 using bash parameter expansion

[ishuar]

📚 Description

fixes #293

🔖 Changes

• Introduce bash parameter expansion to remove trailing slash from the directories path if explicitly added in the values of the arguments.

✅ To-do list

• I updated the CHANGELOG.md to reflect the new feature or fix
• I updated the documentation to reflect the changes

Additional Notes For Reviewer

• Passed explicit / in the argument input.

─$ ./bin/bashunit example/                                            
bashunit - 0.14.1
Running example/custom_functions_test.sh
✓ Passed: Say hi Alice
✓ Passed: Say hi Bob
Running example/script_logic_test.sh
✓ Passed: Script 123
✓ Passed: Script 456

Tests:      4 passed, 4 total
Assertions: 4 passed, 4 total

 All tests passed 
Time taken: 498 ms

[Chemaclass]

Thank you!

[Chemaclass]

@ishuar, can you please add a line on the CHANGELOG.md?