Thanks for the above answers. Special thanks to those who helped in the comment section, it helped a lot.

I forgot to post the answer I did that time. Here's the rust implementation below. I also did a nextjs implementation too. My idea was to develop it for other similar languages. But got busy with other projects. :(

use unicode_segmentation::UnicodeSegmentation;

// Define a struct that holds a grapheme iterator
struct DevanagariSplitter<'a> {
    graphemes: std::iter::Peekable<unicode_segmentation::Graphemes<'a>>,
}

// Implement Iterator trait for DevanagariSplitter
impl<'a> Iterator for DevanagariSplitter<'a> {
    type Item = String;

    fn next(&mut self) -> Option<Self::Item> {
        // Get the next grapheme from the iterator
        let mut akshara = match self.graphemes.next() {
            Some(g) => g.to_string(),
            None => return None,
        };

        // Check if the grapheme ends with a virama
        if akshara.ends_with('\u{094D}') {
            // Peek at the next grapheme and see if it starts with a letter
            if let Some(next) = self.graphemes.peek() {
                if next.starts_with(|c: char| c.is_alphabetic()) {
                    // Append the next grapheme to the current one
                    akshara.push_str(self.graphemes.next().unwrap());
                }
            }
        }

        // Return the akshara as an option
        Some(akshara)
    }
}

// Define a function that takes a string and returns an DevanagariSplitter
fn aksharas(s: &str) -> DevanagariSplitter {
    // Use UnicodeSegmentation to split the string into graphemes
    let graphemes = s.graphemes(true).peekable();
    // Create and return an DevanagariSplitter from the graphemes
    DevanagariSplitter { graphemes }
}

fn main() {
    // Define an input string in devanagari script
    let input = "हिन्दी मुख्यमंत्री हिमंत";

    // Print each akshara separated by spaces using aksharas function
    for akshara in aksharas(input) {
        print!("{} ", akshara);
    }
}

 
// The output of this code is:

// "हि न्दी  मु ख्य मं त्री  हि मं त"