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accepts two mergeable x-monotone curves xc1 and
xc2 and asigns xc with the merged curve. If the target
point of xc1 and the source point of xc2 coincide; then
the source point of xc1 and the target point of xc2 become
the source and target points of xc, respectively. If the target
point of xc2 and the source point of xc1 coincide; then
the source point of xc2 and the target point of xc1 become
the source and target points of xc, respectively.
| Precondition: | are_mergeable_2(xc1, xc2) is true. |
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