Figure this out

This how my code is presently constructed

void update(char * ,char * ,char *);

void update(char * record1,char *record2,char *record3)
{
     
  system("color 2"); 
  
   
  int tell=0;
  int Found=0;
  long int offset = -1;
  char treat[30];
  char app[30];
     
              //Selection structure  to open a text file in reading mode and test if it exits
              if((customer1=fopen("customer1.txt","r+"))==NULL)
                   printf("THE FILE IS EMPTY");
              else
              {
                  //String copy function for storing two of the parameters in the appropriate variables
                  strcpy(treat,record2);
                  strcpy(app,record3);
                   
                  //While function to scan the file until it has reached the end and a logical operator               
                  while( !feof(customer1)&& Found==0)
                      {                                              
                        
                        //Fuction Call to ftell to detect present location in file                                                        
                        offset = ftell(customer1);                        
                        
                        //Scan file data into structure
                        fscanf(customer1,"%s %s %s %s %s %s %s %s\n",info.regis,info.Name,info.address,info.number,info.dob,info.treatment,info.allergies,info.app);
               
                        //Selection structure to use string compare to test for equality
                        if(strcmp(record1,info.regis)==0)
                        Found=1;
                      }
                     
                     //Selection structure
                      if(Found)
                      {                                                  
                        
                         //Function Call to fseek to find a particular postion in the opened file                                            
                        fseek(customer1,offset,SEEK_SET);                                     
                        
                        //Prints updated information to file                    
                        fprintf(customer1,"%s %s %s %s %s %s %s %s ",info.regis,info.Name,info.address,info.number,info.dob,treat,info.allergies,app);
                                       
                       }
                        else 
                        if(!Found)//Selection structure
                         printf("\n\n\t\t THERES NO SUCH RECORD");
                }    
        
     
     //Closes opened file
      fclose(customer1);             
     
                       
}