Using best practices in programming, please design, code, run and test a program based on following criteria. Please note, your code must be written in C $($not a different programming language$).$

$1.$ Upon running the program, it should welcome the user and ask them for input. The value user enters could contain numbers, letters, and symbols.

$2.$ Your program should then remove all non alpha characters. For this program, we can assume the input is not going to exceed $30$ characters.

$3.$ Display the output after removing all non alpha characters.

For instance if the input is:

$-$Hello, $1$ world$$!$

the output is:

Helloworld

$-$Please note this is just an example, and your program needs to be

able to remove non alpha from any user input.

$4.$ Ask the user if they want to repeat. If they say yes, repeat the steps. If not, end the program