code: def remove_linebreaks_within_equations(code):
          r
          code = code.replace('\\\n', '')
          chars = []
          counter = 0
          for char in code:
              if char in ('(', '[', '{'):
                  counter += 1
              elif char in (')', ']', '}'):
                  counter -= 1
              if not (counter and (char == '\n')):
                  chars.append(char)
          return ''.join(chars)
docs: r"""Remove line breaks within equations.
  
          This is not a exhaustive test, but shows how the method works:
  
          >>> code = 'asdf = \\\n(a\n+b)'
          >>> from hydpy.cythons.modelutils import FuncConverter
          >>> FuncConverter.remove_linebreaks_within_equations(code)
          'asdf = (a+b)'