I need help with the structure of my code, its not outputting correctly and i am unsure where exactly its having issues?

$/**$ EX: E$6\mathrm{.}0$

TASK:

Your task is to write code which handles a sequence of input characters

from the UART interface, and responds with the output specified below.

On receipt of the character sequence:

$-$ "foo" your program should print $\text{'}0\text{'}.$

$-$ "bar" your program should print $\text{'}1\text{'}.$

$-$ "foobar" your program should not print either $\text{'}0\text{'}$ or $\text{'}1\text{'}$ as specified

above, but should instead print a linefeed $\text{'}$

$\text{'}$ character.

NOTE:

It is strongly recommended that you design a state machine to complete

this task.

Your solution should use a baud rate of $9600,$ and $8$N$1$ frame format. Your

solution MUST NOT use qutyio.o or qutyserial.o$.$

EXAMPLES:

INPUT: $...$foo.bar.foo.barfoobarfood

OUTPUT: $0101$

$0$

$($START$)0101$

$0($END$)$

INPUT: barsfoosbarforbarfoobarrforfoobarfoobarfood

OUTPUT: $1011$

$0$

$($START$)1011$

$0($END$)$

$*/$

#include

void uart$\_$init$($void$)\{$

PORTB.DIRSET $=$ PIN$2\_$bm; $//$ Enable PB$2$ as output $($USART$0$ TXD$)$

USART$0.$BAUD $=1389$; $//9600$ baud @ $3\mathrm{.}3$ MHz

USART$0.$CTRLB $=$ USART$\_$RXEN$\_$bm $|$ USART$\_$TXEN$\_$bm; $//$ Enable Tx$/$Rx

$\}$

void uart$\_$putc$($char data$)\{$

while $(!($USART$0.$STATUS & USART$\_$DREIF$\_$bm$))$; $//$ Wait for the Data Register to be empty

USART$0.$TXDATAL $=$ data; $//$ Transmit the data

$\}$

uint$8\_$t uart$\_$getc$($void$)\{$

while $(!($USART$0.$STATUS & USART$\_$RXCIF$\_$bm$))$; $//$ Wait for received data

return USART$0.$RXDATAL;

$\}$

typedef enum $\{$

START,

F$1,$ FO$1,$ FOO$1,$ FO$2,$ FOA$2,$ FOR$2,$

B$1,$ BA$1,$ BAR$1$

$\}$ state;

int main$($void$)\{$

uart$\_$init$()$;

state current$\_$state $=$ START;

int foobar$\_$triggered $=0$;

while $(1)\{$

char received$\_$char $=$ uart$\_$getc$()$; $//$ Get input character from UART

switch $($current$\_$state$)\{$

case START:

if $($received$\_$char $==\text{'}$f$\text{'})$ current$\_$state $=$ F$1$;

else if $($received$\_$char $==\text{'}$b$\text{'})$ current$\_$state $=$ B$1$;

else current$\_$state $=$ START;

foobar$\_$triggered $=0$;

break;

case F$1$:

if $($received$\_$char $==\text{'}$o$\text{'})$ current$\_$state $=$ FO$1$;

else current$\_$state $=$ START;

break;

case FO$1$:

if $($received$\_$char $==\text{'}$o$\text{'})$ current$\_$state $=$ FOO$1$;

else current$\_$state $=$ START;

break;

case FOO$1$:

if $($received$\_$char $==\text{'}$b$\text{'})$ current$\_$state $=$ FO$2$;

else $\{$

uart$\_$putc$(\text{'}0\text{'})$;

current$\_$state $=($received$\_$char $==\text{'}$f$\text{'})?$ F$1$ : START;

$\}$

break;

case FO$2$:

if $($received$\_$char $==\text{'}$a$\text{'})$ current$\_$state $=$ FOA$2$;

else $\{$

uart$\_$putc$(\text{'}0\text{'})$;

current$\_$state $=($received$\_$char $==\text{'}$f$\text{'})?$ F$1$ : START;

$\}$

break;

case FOA$2$:

if $($received$\_$char $==\text{'}$r$\text{'})$ current$\_$state $=$ FOR$2$;

else $\{$

uart$\_$putc$(\text{'}0\text{'})$;

current$\_$state $=($received$\_$char $==\text{'}$f$\text{'})?$ F$1$ : START;

$\}$

break;

case FOR$2$:

uart$\_$putc$(\text{'}$

$\text{'})$;

foobar$\_$triggered $=1$;

current$\_$state $=$ START;

break;

case B$1$:

if $($received$\_$char $==\text{'}$a$\text{'})$ current$\_$state $=$ BA$1$;

else $\{$

current$\_$state $=($received$\_$char $==\text{'}$f$\text{'})?$ F$1$ : START;

$\}$

break;

case BA$1$:

if $($received$\_$char $==\text{'}$r$\text{'})\{$

uart$\_$putc$(\text{'}1\text{'})$;

if $(!$foobar$\_$triggered$)$ current$\_$state $=$ START;

$\}$ else $\{$

current$\_$state $=($received$\_$char $==\text{'}$f$\text{'})?$ F$1$ : START;

$\}$

break;

default:

current$\_$state $=$ START;

break;

$\}$

$\}$

$\}$

Ex E$6\mathrm{.}0(0/1)$

FAIL.

Input: $.$foo.bar.foobar.ffoo.bbar.ffoobar.ffoobbar.ffoob.ffooba.obarfoobafooba.abarbarbafoobfoobabarfoofobarfoobaabarofobafoobarafoobarbarfofofoobfofbarbarafoobfoobfoobafofoobfobabbafoobafoofofofoobba.

Expected: $01$

$01$

$0100100110010101$

$10110000000$

$($START$)01$

$01$

$0100100110010101$

$10110000000($END$)$

Observed: $01$

$11001100001$

$011000000$

$($START$)01$

$11001100001$

$011000000($END$)$