How to replace a char from char array in C Program - c

Question

I am developing a shell code in C. Currently, my task is to redirect stdin to stdout with different commands, for instance cat < hello.c -ne > test.txt
I am able to do it, but my code tries to open "<" and ">" file as well, so for that I tried to assign 0 value which doesn't give me any error but ignores -ne.
Here is my code,
int in, out;
int i;
for (i = 0; i < argc; i++) {
if(strcmp( argv[i],"<")==0) {
in = open(argv[i+1], O_RDONLY);
if (!in)
exit(EXIT_FAILURE);
// argv[i]=0;
// array[i+1]=0;
}
else if(strcmp( argv[i],">")==0) {
out = open(argv[i+1], O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IRGRP | S_IWGRP | S_IWUSR);
if (!out)
exit(EXIT_FAILURE);
// argv[i]=0;
// array[i+1]=0;
}
}
dup2(in, 0);
dup2(out, 1);
// close unused file descriptors
close(in);
close(out);
char *bname;
char *path2 = strdup(*argv);
bname = basename(path2);
//printf("%d",argc);
/*the command will be executed using execvp*/
execvp(bname, argv);
argv array would be like
argv[0]="cat"
argv[1]="<"
argv[2]="hello.c"
argv[3]="-ne"
argv[4]=">"
argv[5]="test.txt"
Basically, I want to open multiple files in between "<" and ">" and then redirect to the given file after ">".
The current Output-
$ ./shell
Enter Shell Command -- cat < hello.c -ne > te1.txt
$ cat: : No such file or directory
cat: : No such file or directory
cat: te1.txt: input file is output file