ppc register printing outputs noise

[slugrustle]

I find that running ppc outputs noise after the register values.

Enter a command: ppc
Current Address: 16
Offset: 0
Address Word: 000000000000000000000000000000000000spotIè9♦[ò
Instruction: 000000000000000000ram FiKè9♠Zò
Multiplier Quoticent: 000000000000000000000000000000000000spotⁿè8░[ò
Accumulator: 00000000000000000000000000000000000000R=Lè9☺[ò
Accumulator Int: 0
Multiplier Qotient: 0
Combined Int: 0

Adding length limitations to the string format codes fixed this issue on my system. It appears the strings are not null terminated.

void print_pc(struct program_counter pc)
{

    printf("Current Address: %d\n", pc.current_address);
    printf("Offset: %d\n", pc.offset);

    char* address_word = malloc(WORD_SIZE);
    byte_value_to_string(pc.address_word, address_word, WORD_SIZE);
    printf("Address Word: %.*s\n", WORD_SIZE, address_word);

    char* instruction_string = malloc(INSTRUCTION_SIZE);
    byte_value_to_string(pc.instruction, instruction_string, INSTRUCTION_SIZE);
    printf("Instruction: %.*s\n", INSTRUCTION_SIZE, instruction_string);

    byte_value_to_string(pc.multiplier_quotient, address_word, WORD_SIZE);
    printf("Multiplier Quoticent: %.*s\n", WORD_SIZE, address_word);

    char* accumulator_string = (char*) malloc(ACCUMULATOR_SIZE);
    byte_value_to_string(pc.accumulator, accumulator_string, ACCUMULATOR_SIZE);
    printf("Accumulator: %.*s\n", ACCUMULATOR_SIZE, accumulator_string);    

    printf("Accumulator Int: %lld\n",signed_byte_value(pc.accumulator,ACCUMULATOR_SIZE));
    printf("Multiplier Qotient: %lld\n",signed_byte_value(pc.multiplier_quotient, MULTIPLIER_QUOTIENT_SIZE));

    printf("Combined Int: %lld\n\n",compute_multiplier_accumulator(&pc));

    free(address_word);
    free(instruction_string);
}