feat: remove twinPrime (#1641)

* tests: add missing test of `twinPrime`

* feat: remove `twinPrime`

Maths/TwinPrime.js

@@ -1,29 +0,0 @@
-import { PrimeCheck } from './PrimeCheck'
-
-/**
- * @function twinPrime
- * Gets the 'twin prime' of a prime number.
- *
- * @param {Integer} n The number to find the twin prime of.
- * @returns {Integer} Either the twin, or -1 if n or n + 2 is not prime.
- *
- * @see https://en.wikipedia.org/wiki/Twin_prime
- *
- * @example twinPrime(5) = 7
- * @example twinPrime(4) = -1
- */
-function twinPrime(n) {
-  const prime = PrimeCheck(n)
-
-  if (!prime) {
-    return -1
-  }
-
-  if (!PrimeCheck(n + 2)) {
-    return -1
-  }
-
-  return n + 2
-}
-
-export { twinPrime }

Maths/test/TwinPrime.test.js

@@ -1,10 +0,0 @@
-import { twinPrime } from '../TwinPrime.js'
-
-describe('Twin Primes', () => {
-  it('Should be valid twin primes', () => {
-    expect(twinPrime(3)).toBe(5)
-    expect(twinPrime(5)).toBe(7)
-    expect(twinPrime(4)).toBe(-1)
-    expect(twinPrime(17)).toBe(19)
-  })
-})