/// Removes all non-numeric characters from the input string slice,
/// returning a new String containing only ASCII digits (0-9).
///
/// @param input - The source string slice containing alphanumeric and special characters.
/// @return A new String with all non-numeric characters removed.
pub fn remove_non_numeric(input: &str) -> String {
// 1. Convert the string into a Unicode scalar value (char) iterator via .chars()
// 2. Filter the iterator to keep only characters that are standard ASCII digits
// 3. Collect the filtered characters into a newly allocated String
input
.chars()
.filter(|c| c.is_ascii_digit())
.collect()
}
fn main() {
// Test string provided
let text = "123XYZ +9982-programming 10000000000001language";
// Process the string
let cleaned_text = remove_non_numeric(text);
// Output results
println!("Original: {}", text);
println!("Cleaned: {}", cleaned_text);
}
/*
run:
Original: 123XYZ +9982-programming 10000000000001language
Cleaned: 123998210000000000001
*/
