This function allows you to convert Japanese characters between half-width and full-width size.
Full-width--means that a character occupies two standard character positions.
Half-width - refers to a character occupying a standard character position.
For example: a full-width period is just a dot, and a full-width period is a standard period.
The usual English letters, number keys, and symbol keys are all half-width. Sometimes katakana also uses half-width characters, which look smaller.
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