def trim(s): if not isinstance(s, str): raise TypeError('bad input type')

# 批量寻找，找到成串的统一处理
cnt = 0
i = 0
string = ""
for n in s:
    if n != ' ':
        cnt += 1
    elif cnt > 0:
        string += s[i - cnt:i]
        cnt = 0
    i += 1
return string