Wrong rewriting of label line, when the label is the same as the do loop

For code like :
```fortran
do 10 i = 1, N
goto 10
10 j = i
...
```
the tools transform into
```fortran
do i = 1, N
goto 10
j = i
10 continue
end do
...
```
skipping the line j = i
it should be

```fortran
do i = 1, N
goto 10
10 continue
j = i
end do
...

```
or
```fortran
do i = 1, N
goto 10
10 j = i
end do
...

```

Reproduce the transformation with the fixed-format snippet shown in the issue and compare it with both expected outputs. Trace the converter's handling of a labeled DO loop when its terminal label is also on the loop body, then add a regression test showing that `j = i` is not skipped. Done means the converted code preserves that statement in the loop.

Written by the indexing model from the issue text.