Add Default Value for --name and Improve Error Handling main.rs

[futreall]

Problem

1. Missing default value for the --name parameter:

   • The program required the --name parameter to be explicitly provided. If it was omitted, the execution would fail with an error. This reduced usability and could be problematic if the user forgot to specify --name or was unaware of its necessity.

2. Lack of error handling for the analyze_file function:

   • The analyze_file function returns a result, but its errors were not handled. This could lead to a program panic if the file analysis failed. This is unsafe and negatively impacts the program's stability.

Fixes

1. Adding a default value for the --name parameter:

   • A default value "default_name" was added using the #[arg(default_value = "default_name")] attribute. Now, if the user does not provide the --name parameter, the program will use the default value, preventing errors.

2. Error handling for the analyze_file function:

   • Added error handling for the analyze_file function using expect. If file analysis fails, the program will output a clear error message. This improves stability and makes the program's behavior more predictable.

[fcarreiro]

This PR does not meet my MVV (minimum viable value) standards. However, we'll welcome more substantial and useful changes.