refactor: simplify raw_string creation

src/formatting.rs

@@ -46,7 +46,7 @@ fn test_character_readdition() {
 }
 
 pub fn get_significant_digits(n: &Float) -> usize {
-    let raw_string: String = format!("{n}").chars().filter(|c| *c != '.').collect();
+    let raw_string = n.to_string().replace('.', "");
 
     let mut consecutive_zeros = 0;
     let mut consecutive_nines = 0;