Mark caesar as archived and move archived exercise to own folder (#336)

archive/archived_snakeCase/solution/snakeCase-solution.js

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+const snakeCase = function (string) {
+  // wtf case
+  string = string.replace(/\.\./g, " ");
+
+  // this splits up camelcase IF there are no spaces in the word
+  if (string.indexOf(" ") < 0) {
+    string = string.replace(/([A-Z])/g, " $1");
+  }
+
+  return string
+    .trim()
+    .toLowerCase()
+    .replace(/[,\?\.]/g, "")
+    .replace(/\-/g, " ")
+    .split(" ")
+    .join("_");
+};
+
+module.exports = snakeCase;

archive/archived_snakeCase/solution/snakeCase-solution.spec.js

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+const snakeCase = require('./snakeCase-solution');
+
+describe('snakeCase', () => {
+  test('works with simple lowercased phrases', () => {
+    expect(snakeCase('hello world')).toEqual('hello_world');
+  });
+  test('works with Caps and punctuation', () => {
+    expect(snakeCase('Hello, World???')).toEqual('hello_world');
+  });
+  test('works with longer phrases', () => {
+    expect(snakeCase('This is the song that never ends....')).toEqual(
+      'this_is_the_song_that_never_ends'
+    );
+  });
+  test('works with camel case', () => {
+    expect(snakeCase('snakeCase')).toEqual('snake_case');
+  });
+  test('works with kebab case', () => {
+    expect(snakeCase('snake-case')).toEqual('snake_case');
+  });
+  test('works with WTF case', () => {
+    expect(snakeCase('SnAkE..CaSe..Is..AwEsOmE')).toEqual(
+      'snake_case_is_awesome'
+    );
+  });
+});