Unity 调用oc报错：malloc: *** error for object 0x1ecc0eb0: pointer being freed was not allocated

原始方法：

char* ret = "abc";return ret;

返回char* 方法修改为：

 NSString* sl = @"abc"; char* ret = nullptr; ret = (char*) malloc([sl length] + 1); memcpy(ret,[sl UTF8String],([sl length] + 1)); return ret;