Swift dec to hex (#5627)

* Solves issue with swift not finding the largest two elements correctly

* Solves  #5560 Write a Scala program to convert temperature from celsius to kelvin

* Removes #5560 changes

* F# program to implement linear search (#5295)

* Solves 5173: Write a Haskell program to find the largest three elements in an array

* Create ConvertDecimalToHexadecimal.swift

Converts a decimal number to its hexadecimal representation.a

---------

Co-authored-by: David Fernandez <david@Davids-MacBook-Pro.local>
Co-authored-by: Harsh Raj <harshraj8843@gmail.com>
Co-authored-by: Anandha Krishnan S <anandajith@gmail.com>
Co-authored-by: Ritesh Kokam <61982298+RiteshK-611@users.noreply.github.com>

program/program/convert-decimal-to-hexadecimal/ConvertDecimalToHexadecimal.swift

@@ -0,0 +1,32 @@
+func decimalToHexadecimal(_ decimal: Int) -> String {
+    let hexDigits = "0123456789ABCDEF"
+    var hexString = ""
+    var number = decimal
+
+    while number > 0 {
+        let remainder = number % 16
+        if let hexDigit = hexDigits.character(at: remainder) {
+            hexString = String(hexDigit) + hexString
+        }
+        number /= 16
+    }
+
+    return hexString.isEmpty ? "0" : hexString
+}
+
+extension String {
+    func character(at n: Int) -> Character? {
+        return Array(self)[safe: n]
+    }
+}
+
+extension Array {
+    subscript(safe index: Int) -> Element? {
+        return indices.contains(index) ? self[index] : nil
+    }
+}
+
+// Example usage
+let decimalNumber = 255
+let hexadecimalNumber = decimalToHexadecimal(decimalNumber)
+print("Decimal: \(decimalNumber), Hexadecimal: \(hexadecimalNumber)"