C program to merge two files into third file?

#include <stdio.h> 
#include <stdlib.h> 
void main() 
{ 
FILE *fs1, *fs2, *ft; 
char ch, file1[20], file2[20], file3[20]; 
printf("Enter name of first filen"); 
gets(file1);
printf("Enter name of second filen"); 
gets(file2); 
printf("Enter name of file which will store contents of the two filesn"); 
gets(file3); 
fs1 = fopen(file1, "r"); 
fs2 = fopen(file2, "r"); 
if (fs1 == NULL || fs2 == NULL) 
{ 
printf ("Error in files "); 
exit(0); 
} 
ft = fopen(file3, "w"); 
if (ft == NULL) 
{ printf ("Error in file "); 
exit(0); 
} 
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); 
getch();
}