feat: Working on node builder

Sources/CliDoc/Modifiers/Repeating.swift

@@ -0,0 +1,44 @@
+public extension NodeRepresentable {
+  @inlinable
+  func repeating(_ count: Int, separator: (any NodeRepresentable)? = nil) -> any NodeRepresentable {
+    modifier(RepeatingNode(count: count, separator: separator))
+  }
+}
+
+@usableFromInline
+struct RepeatingNode: NodeModifier {
+
+  @usableFromInline
+  let count: Int
+
+  @usableFromInline
+  let separator: (any NodeRepresentable)?
+
+  @usableFromInline
+  init(
+    count: Int,
+    separator: (any NodeRepresentable)?
+  ) {
+    self.count = count
+    self.separator = separator
+  }
+
+  @usableFromInline
+  func render(_ node: any NodeRepresentable) -> any NodeRepresentable {
+    let input = node.render()
+    var output = input
+    let separator = self.separator != nil
+      ? self.separator!.render()
+      : ""
+
+    guard count > 0 else { return output }
+
+    var count = count - 1
+    while count > 0 {
+      output = "\(output)\(separator)\(input)"
+      count -= 1
+    }
+
+    return output
+  }
+}