feat-표준화 service 추가

+/* eslint-disable no-use-before-define */
+/* eslint-disable no-restricted-syntax */
+const Hangul = require('hangul-js');
+
+const standardize = (word) => {
+  let result = '';
+  let newLetter = '';
+  const disassembledWord = Hangul.disassemble(word);
+  for (const [index, letter] of disassembledWord.entries()) {
+    if (isKorean(letter)) {
+      newLetter = Hangul.isConsonant(letter)
+        ? standardizeConsonent(letter)
+        : standardizeVowel(letter);
+    } else {
+      const preLetter = index === 1 ? '' : disassembledWord[index - 1];
+      const nextLetter = index === disassembledWord.length - 1 ? '' : disassembledWord[index + 1];
+      newLetter = isVowelSpecial(preLetter, letter, nextLetter)
+        ? standardizeSpecialVowel(letter)
+        : standardizeSpecialConsonent(letter);
+    }
+    result += newLetter;
+  }
+  return result;
+};
+
+const isKorean = (word) => {
+  const numCheck = /[0-9]/; // 숫자
+
+  const engCheck = /[a-zA-Z]/; // 문자
+
+  const specialCheck = /[~!@#$%^&*()_+|<>?:{}]/; // 특수문자
+
+  if (!numCheck.test(word) && !engCheck.test(word) && !specialCheck.test(word)) {
+    return true;
+  }
+  return false;
+};
+
+const standardizeConsonent = (letter) => {
+  switch (letter) {
+    case ('ㄱ', 'ㄲ', 'ㅋ'):
+      return 'ㄱ';
+    case ('ㄷ', 'ㄸ', 'ㅌ'):
+      return 'ㄷ';
+    case ('ㅂ', 'ㅃ', 'ㅍ'):
+      return 'ㅂ';
+    case ('ㅅ', 'ㅆ'):
+      return 'ㅅ';
+    case ('ㅈ', 'ㅉ', 'ㅊ'):
+      return 'ㅈ';
+    default:
+      return letter;
+  }
+};
+
+const standardizeVowel = (letter) => {
+  switch (letter) {
+    case ('ㅏ', 'ㅑ'):
+      return 'ㅏ';
+    case ('ㅗ', 'ㅛ'):
+      return 'ㅗ';
+    case ('ㅐ', 'ㅒ', 'ㅔ', 'ㅖ', 'ㅙ', 'ㅚ', 'ㅝ', 'ㅞ'):
+      return 'ㅐ';
+    case ('ㅜ', 'ㅠ'):
+      return 'ㅜ';
+    case ('ㅓ', 'ㅕ'):
+      return 'ㅓ';
+    case ('ㅟ', 'ㅢ', 'ㅣ'):
+      return 'ㅣ';
+    default:
+      return letter;
+  }
+};
+
+const isVowelSpecial = (preLetter, letter, nextLetter) => {
+  if (preLetter !== '') {
+    if (nextLetter === '') {
+      if (isKorean(preLetter)) {
+        if (Hangul.isConsonant(preLetter)) {
+          return true;
+        }
+      }
+    } else if (isKorean(preLetter) && isKorean(nextLetter)) {
+      if (Hangul.isConsonant(preLetter) && Hangul.isConsonant(nextLetter)) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+};
+
+const standardizeSpecialConsonent = (letter) => {
+  switch (letter) {
+    case ('g', 'ㅑ'):
+      return 'ㅏ';
+    case ('ㅗ', 'ㅛ'):
+      return 'ㅗ';
+    case ('ㅐ', 'ㅒ', 'ㅔ', 'ㅖ', 'ㅙ', 'ㅚ', 'ㅝ', 'ㅞ'):
+      return 'ㅐ';
+    case ('ㅜ', 'ㅠ'):
+      return 'ㅜ';
+    case ('ㅓ', 'ㅕ'):
+      return 'ㅓ';
+    case ('ㅟ', 'ㅢ', 'ㅣ'):
+      return 'ㅣ';
+    default:
+      return letter;
+  }
+};
+
+const standardizeSpecialVowel = (letter) => {
+  switch (letter) {
+    case ('g', 'ㅑ'):
+      return 'ㅏ';
+    case ('ㅗ', 'ㅛ'):
+      return 'ㅗ';
+    case ('ㅐ', 'ㅒ', 'ㅔ', 'ㅖ', 'ㅙ', 'ㅚ', 'ㅝ', 'ㅞ'):
+      return 'ㅐ';
+    case ('ㅜ', 'ㅠ'):
+      return 'ㅜ';
+    case ('ㅓ', 'ㅕ'):
+      return 'ㅓ';
+    case ('ㅟ', 'ㅢ', 'ㅣ'):
+      return 'ㅣ';
+    default:
+      return letter;
+  }
+};
+
+module.exports = { standardize };