The work done is given by the line integral $\oint_C F \cdot dr$.
We can parameterize each segment as follows:
$C_1$: $(3t, 0, 0)$, $0 \le t \le 1$
$C_2$: $(3, 3t, t)$, $0 \le t \le 1$
$C_3$: $(3(1-t), 3, 1)$, $0 \le t \le 1$
$C_4$: $(0, 3(1-t), 1-t)$, $0 \le t
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