Move all crates to a top-level crates folder

Co-Authored-By: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/fuzzy/src/char_bag.rs

@@ -0,0 +1,62 @@
+use std::iter::FromIterator;
+
+#[derive(Copy, Clone, Debug, Default)]
+pub struct CharBag(u64);
+
+impl CharBag {
+    pub fn is_superset(self, other: CharBag) -> bool {
+        self.0 & other.0 == other.0
+    }
+
+    fn insert(&mut self, c: char) {
+        if c >= 'a' && c <= 'z' {
+            let mut count = self.0;
+            let idx = c as u8 - 'a' as u8;
+            count = count >> (idx * 2);
+            count = ((count << 1) | 1) & 3;
+            count = count << idx * 2;
+            self.0 |= count;
+        } else if c >= '0' && c <= '9' {
+            let idx = c as u8 - '0' as u8;
+            self.0 |= 1 << (idx + 52);
+        } else if c == '-' {
+            self.0 |= 1 << 62;
+        }
+    }
+}
+
+impl Extend<char> for CharBag {
+    fn extend<T: IntoIterator<Item = char>>(&mut self, iter: T) {
+        for c in iter {
+            self.insert(c);
+        }
+    }
+}
+
+impl FromIterator<char> for CharBag {
+    fn from_iter<T: IntoIterator<Item = char>>(iter: T) -> Self {
+        let mut result = Self::default();
+        result.extend(iter);
+        result
+    }
+}
+
+impl From<&str> for CharBag {
+    fn from(s: &str) -> Self {
+        let mut bag = Self(0);
+        for c in s.chars() {
+            bag.insert(c);
+        }
+        bag
+    }
+}
+
+impl From<&[char]> for CharBag {
+    fn from(chars: &[char]) -> Self {
+        let mut bag = Self(0);
+        for c in chars {
+            bag.insert(*c);
+        }
+        bag
+    }
+}