Removes the specified characters from the beginning of a string
(vl-string-left-trim character-set string)
A string containing a substring of string with all leading characters in character-set removed
_$ (vl-string-left-trim " \t\n" "\n\t STR ")
"STR "
_$ (vl-string-left-trim "12456789" "12463CPO is not R2D2")
"3CPO is not R2D2"
_$ (vl-string-left-trim " " " There are too many spaces here")
"There are too many spaces here"