C, strstr, strings question

Here is a C fonction I have programmed and written here in a simplified manner :

void sub(char *desc, char *text) { 
     char string[255]; 
     char *temp; 
         
     while (!feof(stdin)) { 
            fgets(string, 255, stdin); 
 
         if (!feof(stdin)) { 
             temp = strstr(string, desc); 
 
             if (temp == NULL) { 
                 printf("%s", string); 
             }    
             else {    
                 printf("%s%s", text, temp); 
             } 
         } 
     }    
 } 

What I am getting is after a line that goes into the else clause ( meaning strstr(string, desc) wasn't null ) the following line there are some garbage characters which are printed, even if it only prints the string which should'nt be affected by strstr. I took strstr usage's ( returning it to a char * ) directly from an example on the net. What am I doing wrong here ?