adjust this c program

#include

#include $/*$ srand$(),$ rand$()*/$

#include $/*$ time$()*/$

int main$($void$)\{$

char letter $=\text{'}$A$\text{'},$

grid$[10][10]=\{0\}$;

int i $=0,$

j $=0,$

up $=0,/*$ directions are essentially bools, written as ints to $*/$

down $=0,/*$ conform with C$89$ standard. $*/$

left $=0,$

right $=0,$

move $=0$;

srand$(($unsigned$)$ time$($NULL$))$;

grid$[$i$][$j$]=$ letter$++$;

while $($letter $<=\text{'}$Z$\text{'})\{$

up $=$ down $=$ left $=$ right $=$ move $=0$;

if $($j $+1<10$ && grid$[$i$][$j $+1]==0)$

up $=1$;

if $($j $-1>=0$ && grid$[$i$][$j $-1]==0)$

down $=1$;

if $($i $+1<10$ && grid$[$i $+1][$j$]==0)$

right $=1$;

if $($i $-1>=0$ && grid$[$i $-1][$j$]==0)$

left $=1$;

if $($up $+$ down $+$ left $+$ right $==0)$

break;

move $=$ rand$()\%4$;

$/*$ Intentional fallthrough if direction fails $*/$

switch$($move$)\{$

case $0$:

if $($up$)\{$

grid$[$i$][++$j$]=$ letter$++$;

break;

$\}$

case $1$:

if $($down$)\{$

grid$[$i$][--$j$]=$ letter$++$;

break;

$\}$

case $2$:

if $($right$)\{$

grid$[++$i$][$j$]=$ letter$++$;

break;

$\}$

case $3$:

if $($left$)\{$

grid$[--$i$][$j$]=$ letter$++$;

break;

$\}$

default:

break;

$\}$

$\}$

for $($i $=0$; i $<10$; i$++)\{$

for $($j $=0$; j $<10$; j$++)\{$

if $($grid$[$i$][$j$]==0)$

grid$[$i$][$j$]=\text{'}.\text{'}$;

printf$("\%$c $",$ grid$[$i$][$j$])$;

$\}$

printf$("$

$")$;

$\}$

return $0$;

$\}$

Rather than stopping at $\text{'}$Z$\text{'},$ adjust the program so it continues until the path is blocked.$$ After $\text{'}$Z$\text{'},$ the letters should start over again at $\text{'}$A$\text{'}.$