osa optimisation rapidfuzz#6

use vec! for `curr_distances` construction, as with jaro optimisation rapidfuzz#3

src/lib.rs

@@ -283,15 +283,14 @@ pub fn osa_distance(a: &str, b: &str) -> usize {
 
     let mut prev_two_distances: Vec<usize> = Vec::with_capacity(b_numchars + 1);
     let mut prev_distances: Vec<usize> = Vec::with_capacity(b_numchars + 1);
-    let mut curr_distances: Vec<usize> = Vec::with_capacity(b_numchars + 1);
+    let mut curr_distances: Vec<usize> = vec![0; b_numchars + 1];
 
     let mut prev_a_char = char::MAX;
     let mut prev_b_char = char::MAX;
 
     for i in 0..=b_numchars {
         prev_two_distances.push(i);
         prev_distances.push(i);
-        curr_distances.push(0);
     }
 
     for (i, a_char) in a.chars().enumerate() {