added solution for #1374 Generate a String With Characters That Have …

…Odd Counts.

problems/generate-a-string-with-characters-that-have-odd-counts/README.md

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+# Generate a String With Characters That Have Odd Counts
+
+LeetCode #: [1374](https://leetcode.com/problems/generate-a-string-with-characters-that-have-odd-counts/)
+
+Difficulty: Easy
+
+Topic: String.
+
+## Problem
+
+Given an integer `n`, return a string with `n` characters such that each character in such string occurs an odd number of times.
+
+The returned string must contain only lowercase English letters. If there are multiples valid strings, return any of them.  
+
+Example 1:
+
+```text
+Input: n = 4
+Output: "pppz"
+Explanation: "pppz" is a valid string since the character 'p' occurs three times and the character 'z' occurs once. Note that there are many other valid strings such as "ohhh" and "love".
+```
+
+Example 2:
+
+```text
+Input: n = 2
+Output: "xy"
+Explanation: "xy" is a valid string since the characters 'x' and 'y' occur once. Note that there are many other valid strings such as "ag" and "ur".
+```
+
+Example 3:
+
+```text
+Input: n = 7
+Output: "holasss"
+```
+
+Constraints:
+
+* `1 <= n <= 500`

problems/generate-a-string-with-characters-that-have-odd-counts/generateTheString.js

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+const generateTheString = (n) => {
+  let result = ''
+  let count = n
+
+  if (n % 2 === 0) {
+    result += 'a'
+    count--
+  }
+
+  for (let i = 0; i < count; i++) {
+    result += 'b'
+  }
+
+  return result
+}
+
+module.exports = generateTheString

problems/generate-a-string-with-characters-that-have-odd-counts/generateTheString.test.js

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+const toHexspeak = require('./generateTheString')
+
+test('Example even', () => {
+  const n = 4
+
+  const result = toHexspeak(n)
+
+  expect(result).toBe('abbb')
+})
+
+test('Example odd', () => {
+  const n = 5
+
+  const result = toHexspeak(n)
+
+  expect(result).toBe('bbbbb')
+})