code: def copy_w_plus(src, dst):
      
      dst_ext = get_extension(dst)
      dst_pre = remove_ext   (dst)
  
      while op.exists(dst_pre + dst_ext):
          dst_pre += '+'
  
      shutil.copy(src, dst_pre + dst_ext)
  
      return dst_pre + dst_ext
docs: Copy file from `src` path to `dst` path. If `dst` already exists, will add '+' characters
      to the end of the basename without extension.
  
      Parameters
      ----------
      src: str
  
      dst: str
  
      Returns
      -------
      dstpath: str