C 编程异常 — double free or corruption (fasttop)

问题：运行代码的时候程序崩溃。

*** Error in `./parsing': double free or corruption (fasttop): 0x00000000023d2350 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x81679)[0x7f349ead0679]
./parsing[0x4011fe]
./parsing[0x401b07]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f349ea71505]
./parsing[0x400f59]
======= Memory map: ========
00400000-00413000 r-xp 00000000 08:01 34603142                           /root/Lispy/parsing
00612000-00613000 r--p 00012000 08:01 34603142                           /root/Lispy/parsing
00613000-00614000 rw-p 00013000 08:01 34603142                           /root/Lispy/parsing
023a4000-023df000 rw-p 00000000 00:00 0                                  [heap]
7f3494000000-7f3494021000 rw-p 00000000 00:00 0
7f3494021000-7f3498000000 ---p 00000000 00:00 0
7f34980e5000-7f34980fa000 r-xp 00000000 08
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