Test cases added

runner.c

@@ -1,7 +1,6 @@
 #include "runner.h"
 
-
-int main(int argc, char *argv[]) {
+int main(int argc, char ** argv) {
     char *check_input;
     int token;
     //check_input can be compared to INVALID_ARG and DIFF_ARG to determine if -tok and holds the generated file name if it is
@@ -35,4 +34,4 @@ char *is_tok(int argc, char *argv[]) {
         return FILE_tok;
     }
     return DIFF_ARG;
-} 
+}