getline C

#include <stdio.h>
#include <stdlib.h>

int main(){

char stoparray[5]={'s','t','o','p',};
char *buffer;
size_t buffer_sz = 100;
size_t c;
char run ='y';

buffer = (char *)malloc(buffer_sz * sizeof(char));
    if( buffer == NULL)
    {
      printf("not able to get mem for buffer\n");
      exit(1);
    }

// another means of getttimg lengthb
//size_t c = strlen (buffer);


int ct=0,flag=0;

/*
printf("%zu characters were read.\n",c);
printf("You typed: '%s'\n\n",buffer);

for(int d=0;d<c;d++)
  printf("%c ",buffer[d]);
printf("\n\n");

for(int d=0;d<4;d++)
 printf("%c ",stoparray[d]);
printf("\n\n");
**/

while(run=='y')
{

printf("add whatever \n");
c = getline(&buffer,&buffer_sz,stdin);

printf("You typed: '%s'\nct=%d\n",buffer,ct);

while(ct<4 ){
  for(int a=0;a<c;a++){
 if( stoparray[ct] == buffer[a]){
 printf("found %c  : %c \n",
 buffer[a],stoparray[ct]);
      flag++;
  }
  if(flag == 4) {
   printf("found\n"
    "flag = %d\n"
        "ct=%d\n",flag,ct);

   break; }

  }// end for
ct++;
} // end while

if(flag == 4)
  run='n';
else
{
 flag=0;
 ct=0;
}

} //end while

return 0;
}