8kyu(js): add "Exclamation marks series #2: Remove all exclamation marks

          from the end of sentence"

Author: YeaItsMeThanh

app/8kyu/exclamation-marks-series-number-2-remove-all-exclamation-marks-from-the-end-of-sentence.js

@@ -0,0 +1 @@
+export const remove = string => string.replace(/!+$/, '')

test/8kyu/exclamation-marks-series-number-2-remove-all-exclamation-marks-from-the-end-of-sentence.js

@@ -0,0 +1,19 @@
+import { assert } from 'chai'
+
+import { remove } from '../../app/8kyu/exclamation-marks-series-number-2-remove-all-exclamation-marks-from-the-end-of-sentence.js'
+
+describe('tests', () => {
+    function doTest(input, expected) {
+        const actual = remove(input)
+        assert.strictEqual(actual, expected, `for string:\n"${input}"\n`)
+    }
+
+    it('It should work for basic tests', () => {
+        doTest('Hi!', 'Hi')
+        doTest('Hi!!!', 'Hi')
+        doTest('!Hi', '!Hi')
+        doTest('!Hi!', '!Hi')
+        doTest('Hi! Hi!', 'Hi! Hi')
+        doTest('Hi', 'Hi')
+    })
+})