you end up with cant_corte[i] is 0, and then you strv[i][cant_corte[i] -1] = '\0';
so strv[i][-1] is not a valid address to write.
i do encourage you to learn how to use valgrind with gdb as explained at http://valgrind.org/docs/manual/manual-core-adv.html#manual-core-adv.gdbserver-simple
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