Harmonizes legacy codebases by auto refactoring style inconsistencies Ruby

```ruby
# This example simulates harmonizing a legacy codebase with inconsistent
# styling, focusing on indentation and variable naming.
# In a real-world scenario, you'd use tools like RuboCop with custom
# configurations to perform these refactorings.  This is a simplified,
# illustrative version.

class LegacyCodeHarmonizer
  def initialize(code_string)
    @code = code_string
  end

  def harmonize_indentation
    # Remove all leading whitespace from each line. This ensures a clean slate.
    lines = @code.split("\n").map(&:lstrip)

    # Detect the "dominant" indentation level. In real tools,
    # this would be more sophisticated (e.g., based on the most frequent indentation).
    # Here, we assume a standard 2-space indentation.
    indentation_level = 2

    # Re-indent based on detected indentation.  This function simulates
    # the intelligent application of indentation based on control flow
    # keywords (if, else, def, etc.).  It's simplified.
    reindented_lines = []
    current_indent = 0
    lines.each do |line|
      # Detect control flow keywords and adjust indentation.
      if line.start_with?('end')
        current_indent -= indentation_level if current_indent > 0
      end

      reindented_lines << (" " * current_indent) + line

      if line.end_with?(':', 'do', 'then') || line.start_with?('def', 'class', 'module')
        current_indent += indentation_level
      end
    end

    @code = reindented_lines.join("\n")
    self # Return self for chaining.
  end

  def harmonize_variable_names
    # This is a VERY simplistic example of variable renaming.
    # A robust solution requires parsing the code into an Abstract Syntax Tree (AST).
    # and tracking variable scope.

    # This example replaces 'OldVarName' with 'new_var_name' and 'AnOtherVar' with 'another_var'
    # ONLY IF they are standalone words.  This avoids renaming parts of other words.
    @code.gsub!(/\bOldVarName\b/, 'new_var_name')
    @code.gsub!(/\bAnOtherVar\b/, 'another_var')
    self  # Return self for chaining
  end

  def harmonize_method_names
    # This performs a similar simplistic refactoring of method names from
    # CamelCase to snake_case.
    @code.gsub!(/\b([A-Z][a-z]+)([A-Z][a-z]+)\b/, '\1_\2') # Convert simple two-word CamelCase
    self
  end



  def get_harmonized_code
    @code
  end
end


# Example usage:
legacy_code = <<-RUBY
class MyClass
 def OldMethodName (arg1,AnOtherVar)
  if arg1 > 10:
   OldVarName = arg1 * 2
   return OldVarName
  else
   return AnOtherVar + 1
  end
 end
end
RUBY


harmonizer = LegacyCodeHarmonizer.new(legacy_code)
harmonized_code = harmonizer.harmonize_indentation.harmonize_variable_names.harmonize_method_names.get_harmonized_code

puts "Original Code:\n#{legacy_code}\n"
puts "Harmonized Code:\n#{harmonized_code}"

# Explanation:

# 1. LegacyCodeHarmonizer Class:
#   - This class encapsulates the refactoring logic.
#   - It takes a `code_string` as input in the constructor, representing the legacy codebase.

# 2. harmonize_indentation Method:
#   - Removes leading whitespace to normalize indentation.
#   - Detects a standard indentation level (here, hardcoded to 2).  A more sophisticated real-world tool would analyze existing code.
#   - Iterates through lines and re-indents based on common control flow keywords (`if`, `else`, `def`, `end`, etc.). This is a simplified model.
#     The real application of indentation requires a stateful parser to track scope and nesting properly.
#   - Builds a `reindented_lines` array and joins it back into a string.

# 3. harmonize_variable_names Method:
#   - Provides a VERY basic illustration of variable renaming using `gsub`.  This is **not robust**.
#   - Replaces `OldVarName` with `new_var_name` and `AnOtherVar` with `another_var`, using word boundaries (`\b`) to prevent unintended replacements.
#   - **Important:**  A real-world variable renaming tool needs to parse the code into an Abstract Syntax Tree (AST) to understand variable scope and avoid renaming variables that are not intended to be renamed (e.g., variables in different scopes that happen to have the same name). RuboCop and similar tools use ASTs.

# 4. harmonize_method_names Method:
#   -  Provides a similarly basic illustration of method renaming, from CamelCase to snake_case
#   -  Uses regular expression substitution to attempt to convert method names. The regular expression is limited and might not work in more complex situations.

# 5. get_harmonized_code Method:
#   - Returns the modified code string.

# 6. Example Usage:
#   - Creates an instance of `LegacyCodeHarmonizer` with a sample legacy code snippet.
#   - Calls the `harmonize_indentation` and `harmonize_variable_names` methods, chaining them together.
#   - Prints both the original and harmonized code.

# Limitations and Considerations:

#   - **Simplicity:** This example is a highly simplified illustration.  Real-world code harmonization is significantly more complex.
#   - **AST Parsing:** Robust solutions use Abstract Syntax Tree (AST) parsing to understand the code's structure and semantics.
#   - **Scope Awareness:** Variable renaming requires careful scope analysis. Renaming a variable in one scope might break code in another scope if not handled properly.
#   - **Regular Expressions:** Using regular expressions alone for code refactoring is fragile and can lead to errors. They are useful for simple tasks but not for complex refactorings.
#   - **Configuration:** Real-world tools like RuboCop allow extensive configuration to define style rules and automated fixes.
#   - **Testing:**  Automated testing is crucial after any code refactoring to ensure that the changes haven't introduced bugs.
#   - **Version Control:** Always commit code to version control before and after refactoring to allow for easy rollback if needed.

# Tools like RuboCop, ESLint (for JavaScript), and similar tools are designed to handle code harmonization in a much more robust and reliable way. They use ASTs, allow for extensive configuration, and provide automated fixes for many common style issues.
```