issue #41

- 비밀번호 초기화 로직 1차 구현(테스트 필요)

src/util/generator.ts

@@ -2,4 +2,36 @@ export class Generator {
   static getVerificationCode() {
     return Math.random().toString().slice(2, 8);
   }
+
+  private static getRandomCharacter(string: string) {
+    return string[Math.floor(Math.random() * string.length)];
+  }
+
+  private static getShuffledString(string: string) {
+    let arr = string.split('');
+    
+    for (let i = arr.length - 1; i > 0; i--) {
+      const j = Math.floor(Math.random() * (i + 1));
+      [arr[i], arr[j]] = [arr[j], arr[i]];
+    }
+
+    return arr.join('');
+  }
+  
+  static getResetPasswordCode() {
+    const alphabets = 'abcdefghijklmnopqrstuvwxyz';
+    const numbers = '0123456789';
+    const specials = '!@#$%^';
+    const all = alphabets + numbers + specials;
+
+    let resetPasswordCode = Generator.getRandomCharacter(alphabets);
+    let requiredNumber = Generator.getRandomCharacter(numbers);
+    let requiredSpecial = Generator.getRandomCharacter(specials);
+
+    let shuffledRestPart = Generator.getShuffledString(all).slice(0, 5);
+
+    let shuffledRestCode = Generator.getShuffledString(requiredNumber + requiredSpecial + shuffledRestPart);
+
+    return resetPasswordCode + shuffledRestCode;
+  }
 }