Use execve with argv (Piping)

I got the piping of several commands working. Now Id like to execute this with received arguments (*argv[]) and not hard coded like here.

Ived tried using the rest of the execve family but no progress. Ive been thinking to put everything (argv) in an array of pointers and adding NULL at the end of where each pointer points, then iterate through it.

Passed argument ( , included): echo "test" , wc , rev

int main(int argc, char *argv[]) {

    char *echo[] = {"echo", "test", NULL};
    char *rev[] = {"rev", NULL};
    char *wc[] = {"wc", NULL};
    char **cmd[] = {echo, wc, rev, NULL};

    loop_pipe(cmd);
    return (0);
}

void loop_pipe(char ***cmd) {
    int p[2];
    pid_t pid;
    int fd_in = 0;

    while (*cmd != NULL) {
        pipe(p);
        if ((pid = fork()) == -1) {
            exit(EXIT_FAILURE);
        } else if (pid == 0) {
            dup2(fd_in, 0); //change the input according to the old one
            if (*(cmd + 1) != NULL)
                dup2(p[1], 1);
            close(p[0]);
            execvp((*cmd)[0], *cmd);
            exit(EXIT_FAILURE);
        } else {
            wait(NULL);
            close(p[1]);
            fd_in = p[0]; //save the input for the next command
            cmd++;
        }
    }
}