Write a C program that opens file1 which only contains this line: dcab and then opens the empty file2. Your program should write acbd to file2. You may only declare one uninitialized char variable and...

Write a C program that opens file1 which only contains this line:
dcab
and then opens the empty file2. Your program should write acbd to file2. You
may only declare one uninitialized char variable and may not have any loops, conditionals, or include statements, or library functions, and may not use lseek or do
any arithmetic with ascii codes. Solve the problem by using system calls directly.
Enter your code here (you must use the following header to main):
#include

int main(void) {
return 0;
}