Programming

#include <stdio.h>
 
FILE* fileopen();
void read_line(void*);
 
void read_line(void *fh){
              char s[50];
              int i,n;
                            if( fgets(s,49,fh) != NULL) {
                                n = 0;
                                    while(isspace(s[n])){
                                        n++;
                                        if(s[n] == '/' && s[n++] == '/'){
                                                fgets(s,49,fh);
                                }
                             }
                                      printf("%s", s);
                            }
                            else{
                                    rewind(fh);
                            }
}
FILE* fileopen(){
          void *file = fopen("abc1.txt", "r");
            return file;
}
int main(void) {
           void *fh;
            int i;
              fh = fileopen();
               for(i = 0;i < 12; i++){
                 read_line(fh);
                }
              return 0;
}

6  7
8 9
12 13

6  7
8 9
12 13
6  7
8 9
12 13
6  7
8 9
12 13