public static List<string> JieWordByLen(this string word,int len)
{
var arr = new List<string>();
var ss = word.ToCharArray();
var st = "";
for (var i = 0; i < ss.Length; i = i + 1)
{
if (st.Length < len)
st += ss[i];
else
{
arr.Add(st);
st = "";
}
}
return arr;
}
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