Typos fix fuel

[romashka-btc]

Description of Changes

1. Fixing the Use of Undeclared Variables

• Fixed instances of accessing variables that were not declared.
• Prevented potential ReferenceError issues.
• Main causes of the problem:
  • Typographical errors in variable/parameter names.
  • Accidental creation of global variables.

2. Removal of Unused Variables

• Removed variables that were declared but not used in the code.
• Improved code readability and resolved potential performance issues.
• If a variable was intentionally left unused, a _ prefix was added to avoid false flags.

3. Fixing Incorrect Assignment Operators

• Corrected errors where =- was used instead of -= or =+ instead of +=.
• Example: The line x =- 1 was replaced with either x -= 1 or x = -1, depending on the context.

Reasons for Changes

• To avoid runtime errors and improve code quality.
• To remove unused variables for easier maintenance.
• To fix typos ensuring proper operator functionality.

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