My edit.c has three functions:
    
    //
    // Shift the chararacters in s one position to the left.
    //
    void shiftleft(char s[])
    {
        ...
    }
    
    //
    // Shift the chararacters in s one position to the right.
    //
    void shiftright(char s[])
    {
        ...
    }
    
    void edit(char s[], char ops[])
    {
        ...
    }