Untitled

import Foundation
class Solution {
    var password = ""
    var stepsNeeded = 0
    let minimumChar = 6
    let maximumChar = 20
    
    func strongPasswordChecker(_ password: String) -> Int {
        self.password = password
        
        if !oneUpperLetterExist() {
            stepsNeeded += 1
        }
        
        if !oneLowerLetterExist() {
            stepsNeeded += 1
        }
        
        if !oneDigitExist() {
            stepsNeeded += 1
        }
        
        print(stepsNeeded)
        
        let array = threeRepeatingCharacterCount()
        print(array)
        for rep in array {
            stepsNeeded += (rep - 2)
        }
        
        print(stepsNeeded)

        
        if !minimumCharacterExists() {
            let count = password.count
    
            if count > maximumChar {
                stepsNeeded = count - maximumChar
            }
            else if count < minimumChar {
                stepsNeeded = minimumChar - count
            }
        }
        
        return stepsNeeded
    }
    
    func minimumCharacterExists()-> Bool {
        return self.password.count >= 6 && password.count <= 20
    }
    func oneUpperLetterExist()-> Bool {
        let uppercaseLetters = CharacterSet.uppercaseLetters
        let lettersRange = self.password.rangeOfCharacter(from: uppercaseLetters)
        return lettersRange != nil
    }
    func oneLowerLetterExist()-> Bool {
        let lowercaseLetters = CharacterSet.lowercaseLetters
        let lettersRange = self.password.rangeOfCharacter(from: lowercaseLetters)
        return lettersRange != nil
    }
    func oneDigitExist()-> Bool {
        let decimalCharacters = CharacterSet.decimalDigits
        let decimalRange = self.password.rangeOfCharacter(from: decimalCharacters)
        return decimalRange != nil
    }
    func threeRepeatingCharacterCount()-> [Int] {
        var repeatingCharactersCount = [Int]()
        var repeatingCharacters = [Character]()
        var passRef = self.password

        var firstIndex = passRef.startIndex
        while (firstIndex != passRef.endIndex) {
            
            var secondIndex = passRef.index(after: firstIndex)
            var count = 0
            while (secondIndex != passRef.endIndex) {
                if (passRef[firstIndex] == passRef[secondIndex]) {
                    count += 1
                }
                secondIndex = passRef.index(after: secondIndex)
            }
            
            repeatingCharactersCount.append(count)
            count = 0
            firstIndex = passRef.index(after: firstIndex)
        }
        return repeatingCharactersCount
    }
    
    
    
    

}

let count = Solution.init().strongPasswordChecker("1337C0d3")