There is a memory leak in Write_To_24LCxx

[afiskon]

for instance, in nucleo-f411RE/src/ch14/main-ex1.c:

  data = (uint8_t*)malloc(sizeof(uint8_t)*(len+2));

// ...

  /* We are now ready to transfer the buffer over the I2C bus */
  returnValue = HAL_I2C_Master_Transmit(hi2c, DevAddress, data, len + 2, HAL_MAX_DELAY);
  if(returnValue != HAL_OK)
    return returnValue; // <--- !!! you forgot to call free() here

free(data);