question: public static int lastIndexOfIgnoreCase ( String src , char c , int startIndex , int endIndex ) { int total = src . length ( ) - 1 ; if ( total < 0 ) { return - 1 ; } if ( startIndex >= total ) { startIndex = total ; } if ( endIndex < 0 ) { endIndex = 0 ; } c = Character . toLowerCase ( c ) ; for ( int i = startIndex ; i >= endIndex ; i -- ) { if ( Character . toLowerCase ( src . charAt ( i ) ) == c ) { return i ; } } return - 1 ; }
target:  Finds last index of a character in the given source string in specified range [end, start]