How can I open a file in c using fgets() and an input file?

Question

I am trying to open the file indicated by the input file[100]. I keep getting a segmentation fault. I know that there is some problem with the fgets() function, but I am not exactly sure what it is. I can't get any code inside the loop to run. The final code is supposed to take the file from the first line of a text file, but it does not work. Any help would be appreciated, and I can post the main function code if needed!

    #include <stdio.h>
    #include <stdlib.h>
    #include <math.h>
    #include <numInt.h>
    #include <string.h>


    char *getCoeff(char file[100], char chemName[50])
    {
            FILE* fptr = fopen(file, "r");
            char data[80];
            char *dataptr = data;
            char line[80];
            int count = 0;
            int i = 0;
            printf("%s",file);

            while (fgets(line, sizeof line, fptr) != NULL)
            {
                     printf("Inside loop\n");
                     printf("%s",line);
                     strcpy(data,line);

             }
             fclose(fptr);

             return dataptr;
    }