Loading a file into memory and then executing it (no operating system)

Question

My program (written in c) loads other programs into memory before executing them. This is the code I do that with:

void (*jumpToExec)(void) = (void (*)())0x0801;

void loadExecutable(char* executable) {
    cbm_k_setnam(executable);
    cbm_k_setlfs(0, 8, 0);
    cbm_k_load(1, 0x0801);

    jumpToExec();
}

(Please ignore the CBM-DOS calls, they are not relevant. They basically just identify a file and load it into memory)

executable, in this case, points to a program built from this code:

int otherMain() {
    printf("Hello, world!");

    return EXIT_SUCCESS;
}

How do I run the function otherMain() in this separate program when the function loadExecutable() in the main program loads it?