[Fix] 制約の適用を調整した (#96)

* zenz-v1側は制約をコードポイントレベルで喋るので、grapheme clusterに非依存の処理に書き換えた

* EOSを考慮するように変更

Sources/SwiftUtils/ArrayUtils.swift

@@ -86,6 +86,20 @@ public extension Collection {
 }
 
 public extension Collection where Self.Element: Equatable {
+    /// Returns a Bool value indicating whether the collection has the given prefix.
+    /// - Parameters:
+    ///   - prefix: A collection to search for at the start of this collection.
+    /// - Returns: A Bool value indicating whether the collection has the given prefix.
+    @inlinable func hasPrefix(_ prefix: some Collection<Element>) -> Bool {
+        if self.count < prefix.count {
+            return false
+        }
+        for (u, v) in zip(self, prefix) where u != v {
+            return false
+        }
+        return true
+    }
+
     /// Returns a Bool value indicating whether the collection has the given suffix.
     /// - Parameters:
     ///   - suffix: A collection to search for at the end of this collection.