Help, please! What's wrong with my C code? It isn't working. Can you help me with the decryption and encryption logic? The screen shot at the end is what the 'Expected Outcome' should be once you compile and run the code $($the cipher text as shown in the screen shot is supposed to be converted to uppercase$)$: #include "railcipher.h$"$

#include

#include

#include

#include

#define MAX$\_$TEXT$\_$LENGTH $1024$

#define MAX$\_$KEY$\_$LENGTH $26$

int main$($int argc, char $*$argv$[])\{$

int key$[$MAX$\_$KEY$\_$LENGTH$]$;

int keyLength $=$ validateKey$($argc$,$ argv, key$)$;

if $($keyLength $==-1)$

return $1$;

char command$[$MAX$\_$TEXT$\_$LENGTH $+8],$ result$[$MAX$\_$TEXT$\_$LENGTH$]$;

printf$("$Enter command $($encrypt$/$decrypt$/$quit$)$: $")$;

while $($fgets$($command$,$ sizeof$($command$),$ stdin$))\{$

command$[$strcspn$($command$,"")]=0$;

if $($strncmp$($command$,$ "quit", $4)==0)\{$

break;

$\}$ else $\{$

processCommand$($command$,$ key, keyLength, result$)$;

printf$("\%$s$",$ result$)$;

$\}$

printf$("$Enter command $($encrypt$/$decrypt$/$quit$)$: $")$;

$\}$

return $0$;

$\}$

int validateKey$($int argc, char $*$argv$[],$ int $*$key$)\{$

if $($argc $<mtext\; id="EditorElement\_2244700"></mtext><mn\; id="EditorElement\_2244701">3</mn><mi\; id="EditorElement\_2244702">)</mi><mtext\; id="EditorElement\_2244703"></mtext><mi\; id="EditorElement\_2244704">\{</mi>$

printf$("$Usage: $\%$s

$",$ argv$[0])$;

return $-1$;

$\}$

int keyLength $=$ atoi$($argv$[1])$;

if $($keyLength $<mtext\; id="EditorElement\_2244826"></mtext><mn\; id="EditorElement\_2244827">1</mn><mtext\; id="EditorElement\_2244828"></mtext><mi\; id="EditorElement\_2244829">|</mi><mi\; id="EditorElement\_2244830">|</mi>$ keyLength $>$ MAX$\_$KEY$\_$LENGTH$)\{$

printf$("$Error: Invalid key length.

$")$;

return $-1$;

$\}$

for $($int i $=0$; i $$ keyLength; i$++)\{$

key$[$i$]=$ atoi$($argv$[$i $+2])$;

$\}$

return keyLength;

$\}$

void processCommand$($const char $*$command$,$ const int $*$key$,$ int keyLength, char $*$result$)\{$

char text$[$MAX$\_$TEXT$\_$LENGTH$]$;

if $($sscanf$($command$,$ "encrypt $\%1023$s$",$ text$)==1)\{$

encrypt$($text$,$ key, keyLength, result$)$;

$\}$ else if $($sscanf$($command$,$ "decrypt $\%1023$s$",$ text$)==1)\{$

decrypt$($text$,$ key, keyLength, result$)$;

$\}$ else $\{$

strcpy$($result$,$ "Invalid command. Please enter 'encrypt', 'decrypt', or 'quit'."$)$;

$\}$

$\}$

void encrypt$($const char $*$text$,$ const int $*$key$,$ int keyLength, char $*$result$)\{$

int length $=$ strlen$($text$)$;

char rail$[$keyLength$][$length$]$;

memset$($rail$,\text{'}\backslash 0\text{'},$ sizeof$($rail$))$;

int row $=0,$ col $=0$;

int direction $=0$;

for $($int i $=0$; i $$ length; $++$i$)\{$

rail$[$row$][$col$++]=$ text$[$i$]$;

if $($row $==0)$ direction $=0$;

else if $($row $==$ keyLength $-1)$ direction $=1$;

direction $?$ row$--$ : row$++$;

$\}$

int idx $=0$;

for $($int i $=0$; i $$ keyLength; $++$i$)\{$

for $($int j $=0$; j $$ length; $++$j$)\{$

if $($rail$[$i$][$j$]!=\text{'}\backslash 0\text{'})\{$

result$[$idx$++]=$ toupper$($rail$[$i$][$j$])$; $//$ Convert to uppercase

$\}$

$\}$

$\}$

result$[$idx$]=\text{'}\backslash 0\text{'}$; $//$ Null$-$terminate the result string

$\}$

void decrypt$($const char $*$text$,$ const int $*$key$,$ int keyLength, char $*$result$)\{$

int length $=$ strlen$($text$)$;

char rail$[$keyLength$][$length$]$;

memset$($rail$,\text{'}\backslash 0\text{'},$ sizeof$($rail$))$;

$-./01$railcipher:

STDIN: $[$

$-$Test Case #$0$:

encrypt hello world!

quit

$]$

CLAs: $[./01$rai.lcipher $4\mathrm{.}5-12]$

STDOUT: $[$Help$,$ please write in C$.$ Create a rail$$ipher$.$s$,$ railcipher. h$,$ and makefile.

railcipher: Fatal error! First CLA must be a valid integer.

$]$

STDIN: $[$

decrypt HWELLLORDO

quit

$]$

STDOUT: $[$

railcyipher: Fatal error! The encryption key passed as CLAs is not valid.

$]$

STDIN: $[$

$--$Test Case #$2$:

encrypt hello world!

decrypt HWELLLORDO

quit

$]$

STDOUT: $[$

railcsipher: Fatal error! The encryption key length cannot exceed $26.$

$]$

STDIN: $[$

$--$Test Case #$3$:

encrypt Attack postponed until two A$.$M$.$

decrypt T$.$TNAAPTMTSUOAODWCGOIXKNLYPET.Z

quit

$]$

STDOUT: $[$

TTNAAPTMTSUOAODWCOIXKNLYPETZ

ATTACKPOSTPONEDUNTILTWOAMXYZ

$]$

int row $=0,$ col $=0$;

int direction $=0$;

for $($int i $=0$; i $$ length; $++$i$)\{$

rail$[$row$][$col$++]=1$;

if $($row $==0)\{$

direction $=0$;

$\}$ else if $($row $==$ keyLength $-1)\{$

direction $=1$;

$\}$

direction $?$ row$--$ : row$++$;

$\}$

int idx $=0$;

for $($int i $=0$; i $$ keyLength; $++$i$)\{$

for $($int j $=0$; j $$ length; $++$j$)\{$

if $($rail$[$i$][$j$]==1$ && idx $$ length$)\{$

rail$[$i$][$j$]=$ text$[$idx$++]$;

$\}$

$\}$

$\}$

memset$($result$,0,$ length $+1)$;

row $=$ col $=$ idx $=0$;

direction $=0$;

for $($int i $=0$; i $$ length; $++$i$)\{$

result$[$idx$++]=$ rail$[$row$][$col$++]$;

if $($row $==0)$ direction $=0$;

else if $($row $==$ keyLength $-1)$ direction $=1$;

direction $?$ row$--$ : row$++$;

$\}$

result$[$idx$]=\text{'}\backslash 0\text{'}$;