feat: Updates styles

Sources/ViewController/Extensions/String+double.swift

@@ -0,0 +1,14 @@
+import Foundation
+
+private let numberFormatter: NumberFormatter = {
+  let formatter = NumberFormatter()
+  formatter.numberStyle = .decimal
+  formatter.maximumFractionDigits = 2
+  return formatter
+}()
+
+extension String.StringInterpolation {
+  mutating func appendInterpolation(double: Double) {
+    appendInterpolation(numberFormatter.string(from: NSNumber(value: double))!)
+  }
+}