Write a program to remove all comments from a C program. Don’t forget to handle quoted strings and character constants properly. C comments do not nest.

#include <stdio.h>

void rcomment(int c);
void in_comment(void);
void echo_quote(int c);

/*remove all comments from a valid c program     */
int main(){
      int c, d;

      while((c =getchar()) != EOF)
           rcomment(c);
     return 0;
}
/*rcomment: read each character, remove the comments  */
void rcomment(int c){
     int d;

     if (c == '/')
        if ((d= getchar()) == '*')
              in_comment();       /* beginner comment */
        else if(d == '/')
              putchar(c);         /* another slash */
              rcomment(d);
        } else {
                putchar(c);
                putchar(d);
         }
    else if (c == '\' ' || c == ' '' ')
           ech0_quote(c);          /* quote begins */
    else
         putchar(c);        /* not a comment */
}
/* in_comment: inside of a valid comment */
void in_comment(void){
     int c, d;

     c = getchar();   /* prev character  */
     d = getchar();   /* curr character */
     while (c != '*' && d != '/'){  * search for end */
            c =d;
            d =getchar();
    }
}
/*echo_quote: echo characters within quotes */
void echo_quote(int c){
      int d;

       putchar(c);
       while((d =getchar()) != c) {  /*search for end */
             putchar(d);
             if (d == '\\')
                 putchar(getchar());   /* ignore escape seq */
       }
        putchar(d);
}