Add cases

flake.lock

rtree-c/src/ReduceC.hs

rtree-c/test/cases/main.c

rtree-c/test/cases/while-loops.c

rtree-c/test/expected/main/main.c

rtree-c/test/expected/main/reduction/r.c

rtree-c/test/expected/main/reduction/r.choices

rtree-c/test/expected/typedef/reduction/r000.c

rtree-c/test/expected/typedef/reduction/r000.choices

rtree-c/test/expected/typedef/reduction/r001.c

rtree-c/test/expected/typedef/reduction/r001.choices

rtree-c/test/expected/typedef/reduction/r010.c

rtree-c/test/expected/typedef/reduction/r010.choices

rtree-c/test/expected/typedef/reduction/r011.c

rtree-c/test/expected/typedef/reduction/r011.choices

rtree-c/test/expected/typedef/reduction/r100.c

rtree-c/test/expected/typedef/reduction/r100.choices

rtree-c/test/expected/typedef/reduction/r101.c

rtree-c/test/expected/typedef/reduction/r101.choices

rtree-c/test/expected/typedef/reduction/r110.c