Unknown amount of command line inputs

main.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define SIZE 50
int main(void)
{
        char *str = malloc(SIZE);
        puts("Enter name to search. Type Quit to exit.");
        fgets(str, sizeof str, stdin);

        while (strcmp(str, "quit\n") != 0)
        {
                char tempStr[SIZE];
                fgets(tempStr, sizeof tempStr, stdin);
                strncat(str, tempStr, strlen(tempStr));
                printf("tempStr %s\n", tempStr);
                printf("str %s", str);
                printf("\n");
        }
}