Restructure folders.

src/algorithms/sets/combinations/__test__/combineWithRepetitions.test.js

@@ -1,5 +1,5 @@
 import combineWithRepetitions from '../combineWithRepetitions';
-import factorial from '../../factorial/factorial';
+import factorial from '../../../math/factorial/factorial';
 
 describe('combineWithRepetitions', () => {
   it('should combine string with repetitions', () => {

src/algorithms/sets/combinations/__test__/combineWithoutRepetitions.test.js

@@ -1,5 +1,5 @@
 import combineWithoutRepetitions from '../combineWithoutRepetitions';
-import factorial from '../../factorial/factorial';
+import factorial from '../../../math/factorial/factorial';
 
 describe('combineWithoutRepetitions', () => {
   it('should combine string without repetitions', () => {

src/algorithms/sets/permutations/__test__/permutateWithoutRepetitions.test.js

@@ -1,5 +1,5 @@
 import permutateWithoutRepetitions from '../permutateWithoutRepetitions';
-import factorial from '../../factorial/factorial';
+import factorial from '../../../math/factorial/factorial';
 
 describe('permutateWithoutRepetitions', () => {
   it('should permutate string', () => {