152 % 10 is 2. 2 is STX (start of text). That's a control character which is non-printing.
https://en.wikipedia.org/wiki/Control_character
The start of text character (STX) marked the end of the header, and
the start of the textual part of a stream.
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
