Fix memory leaks

[araujo88]

Description

Fixes memory leaks.

Related Issue

Fixes #79

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Performance improvement

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have documented my changes in the code or documentation
• I have added tests that prove my changes work (if applicable)
• All new and existing tests pass

[araujo88]

Weird, this test pass locally:

tests/test_brainrot.py::test_brainrot_examples[division_by_zero-Error: Division by zero at line 5] PASSED [  4%]

But in the CI in gives segfault:

 FAILED test_brainrot.py::test_brainrot_examples[division_by_zero-Error: Division by zero at line 5] - AssertionError: Output for division_by_zero did not match.
  Expected:
  Error: Division by zero at line 5
  Actual:
  Error: Division by zero at line 5
  Segmentation fault (core dumped)
assert 'Error: Divis...(core dumped)' == 'Error: Divis...ero at line 5'
  
  - Error: Division by zero at line 5
  + Error: Division by zero at line 5
  ?                                  +
  + Segmentation fault (core dumped)

[SIGMazer]

finally no leak anymore