code: def camel_to_snake(camel):
      
      ret = []
      last_lower = False
      for char in camel:
          current_upper = char.upper() == char
          if current_upper and last_lower:
              ret.append("_")
              ret.append(char.lower())
          else:
              ret.append(char.lower())
          last_lower = not current_upper
      return "".join(ret)
docs: Convert camelCase to snake_case.