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Write a C program myprog that can accept an arbitrary number of command line arguments, e$.$g$.$

myprog Hello, world!

You are not allowed to use any standard string manipulation functions from $.$

myprog must print each argument starting with the first character on the first line, two characters on the second line, etc. myprog must exclude all characters other than a through z and A through Z$.$ For the parameters specified above, myprog must produce the following output:

H

He

Hel

Hell

Hello

W

Wo

Wor

Worl

World

Use three test cases to verify the correctness of your code as follows:

myprog

myprog Have a nice day!

myprog paraskevidekatriaphobia $=$ Friday $13.$

#include

$//$ Step $2$: Function to check if a character is an alphabet $($A$-$Z or a$-$z$)$

int is$\_$alpha$($char c$)\{$

return $($c $>=\text{'}$A$\text{'}$ && c Z$\text{'})||($c $>=\text{'}$a$\text{'}$ && c z$\text{'})$;

$\}$

$//$ Step $3$: Function to print filtered arguments

void print$\_$filtered$\_$arguments$($int argc, char $*$argv$[])\{$

$//$ Iterate through each argument

for $($int i $=1$; i $$ argc; i$++)\{$

int len $=0$;

$//$ Count the number of valid characters in the current argument

for $($int j $=0$; argv$[$i$][$j$]!=\text{'}\backslash 0\text{'}$; j$++)\{$

if $($is$\_$alpha$($argv$[$i$][$j$]))\{$

len$++$;

$\}$

$\}$

$//$ Print the filtered argument line by line

for $($int k $=1$; k len; k$++)\{$

int count $=0$;

for $($int j $=0$; argv$[$i$][$j$]!=\text{'}\backslash 0\text{'}$ && count $$ k; j$++)\{$

if $($is$\_$alpha$($argv$[$i$][$j$]))\{$

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

count$++$;

$\}$

$\}$

printf$("$

$")$;

$\}$

$\}$

$\}$

$//$ Step $4$: Main function

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

$//$ Call the function to print filtered arguments

print$\_$filtered$\_$arguments$($argc$,$ argv$)$;

return $0$;

$\}$