Full-width characters compatibility and max_width adjustability
#30
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Since Chinese characters are full-width (twice larger than half-width characters, e.g., ASCII characters), the previous version break lines corresponding to the length of a string but not the true width of the string. I tried to modified it so it can determine when to break lines correctly.
Also, I want to adjust the value of

max_width(default 49 characters). I simply add this argument for each functions so that I can adjust its value.