input: def port_code(java_code: str) -> str:
      """ Converts a given Java code snippet to Python 3 code.
      >>> port_code('public class Foo { public int foo( int a, int b ) { return a + b; } }')
      'def foo(a, b):\\n return a + b'
      """
output:     import re
  
      # Remove Java class declaration
      java_code = re.sub(r'public\s+class\s+\w+\s*\{', '', java_code)
      java_code = re.sub(r'\}\s*$', '', java_code)
  
      # Remove Java method modifiers
      java_code = re.sub(r'public\s+', '', java_code)
      java_code = re.sub(r'private\s+', '', java_code)
      java_code = re.sub(r'protected\s+', '', java_code)
  
      # Convert Java method to Python function
      java_code = re.sub(r'(\w+)\s+(\w+)\s*\(([^)]*)\)\s*\{', r'def \2(\3):\n', java_code)
  
      # Remove Java return type
      java_code = re.sub(r'(\w+)\s+(\w+)\s*\(', r'\2(', java_code)
  
      # Convert Java return statement to Python return statement
      java_code = re.sub(r'return\s+', 'return ', java_code)
  
      # Remove Java method closing bracket
      java_code = re.sub(r'\}\s*$', '', java_code)
  
      # Add indentation to the function body
      lines = java_code.split('\n')
      for i in range(1, len(lines)):
          if lines[i].strip():
              lines[i] = ' ' * 4 + lines[i]
  
      return '\n'.join(lines)