strwidth() - returns the display width of a string
int strwidth( string str );
strwidth() returns the number of columns to display string 'str'.
The driver uses rules defined in https://www.unicode.org/reports/tr11/tr11-36.html
to calcuate character width.
Control characters have no width. Wide characters, including emojis are two
columns wide. This rule is also used by sprintf() to layout strings.
strlen()