plan search db

src-core/src/db/search.rs

@@ -0,0 +1,17 @@
+#[allow(unused)]
+pub(super) fn normalize_reading(s: &str) -> String {
+    s.chars()
+        .map(|c| {
+            if c >= 'ア' && c <= 'ン' {
+                // Katakana range
+                if let Some(x) = char::from_u32(c as u32 - 0x60) {
+                    x // Convert to Hiragana
+                } else {
+                    c // Ensure it's a valid char
+                }
+            } else {
+                c // Return the character as is if it's not in the range
+            }
+        })
+        .collect()
+}