This grammar need antlr 4.8
Please put antlr-4.8-complete.jar in current path.
run make command in current path
/* run command */
java -cp ./antlr-4.8-complete.jar:. testLexer sample.c
java -cp ./antlr-4.8-complete.jar:. testLexer test.c
java -cp ./antlr-4.8-complete.jar:. testLexer lexer.sample.c