Removes the specified characters from the end of a string
(vl-string-right-trim character-set string)
A string containing a substring of string with all trailing characters in character-set removed.
_$ (vl-string-right-trim " \t\n" " STR \n\t ")
" STR"
_$ (vl-string-right-trim "1356789" "3CPO is not R2D267891")
"3CPO is not R2D2"
_$ (vl-string-right-trim " " "There are too many spaces here ")
"There are too many spaces here"