Try to remove functions first.

rtree-c/src/ReduceC.hs

rtree-c/test/cases/small/functions.c

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

rtree-c/test/expected/functions/reduction/r000000000.c

rtree-c/test/expected/functions/reduction/r000000001.c

rtree-c/test/expected/functions/reduction/r000000010.c

rtree-c/test/expected/functions/reduction/r000000011.c

rtree-c/test/expected/functions/reduction/r000000100.c

rtree-c/test/expected/functions/reduction/r000000101.c

rtree-c/test/expected/functions/reduction/r000000110.c

rtree-c/test/expected/functions/reduction/r000000111.c

rtree-c/test/expected/functions/reduction/r0000010.c

rtree-c/test/expected/functions/reduction/r0000011.c

rtree-c/test/expected/functions/reduction/r000010000.c

rtree-c/test/expected/functions/reduction/r000010001.c

rtree-c/test/expected/functions/reduction/r000010010.c

rtree-c/test/expected/functions/reduction/r000010011.c

rtree-c/test/expected/functions/reduction/r000010100.c

rtree-c/test/expected/functions/reduction/r000010101.c

rtree-c/test/expected/functions/reduction/r00001011.c