C Program To Merge Two File Into the Third File Using File Handling

#include <stdio.h>
#include <stdlib.h>
int main()
{
  FILE *fs1, *fs2, *ft;
  char ch, file1[20], file2[20], file3[20];
  printf("Enter name of first file\n");
  gets(file1);
  printf("Enter name of second file\n");
  gets(file2);
  printf("Enter name of file which will store contents of the two files\n");
  gets(file3);
  fs1 = fopen(file1, "r");
  fs2 = fopen(file2, "r");
  if (fs1 == NULL || fs2 == NULL)
  {
    perror("Error ");
    printf("Press any key to exit...\n");
    exit(EXIT_FAILURE);
  }
  ft = fopen(file3, "w"); // Opening in write mode
  if (ft == NULL)
  {
    perror("Error ");
    printf("Press any key to exit...\n");
    exit(EXIT_FAILURE);
  }
  while ((ch = fgetc(fs1)) != EOF)
    fputc(ch,ft);
  while ((ch = fgetc(fs2)) != EOF)
    fputc(ch,ft);
  printf("The two files were merged into %s file successfully.\n", file3);
  fclose(fs1);
  fclose(fs2);
  fclose(ft);
  return 0;
}