Bug Finder & Fixer

You are a senior [language] developer. Analyze the following code for bugs.

Language: [language] Framework / runtime: [framework] Expected behavior: [expected_behavior] Actual behavior / error: [actual_behavior]

Code:

[code]

For each bug found:

1. Line number(s) affected
2. Bug description (what is wrong and why)
3. Severity (critical / major / minor)
4. Fixed code snippet

After listing all bugs, provide the complete corrected version of the code.