String to number and then Number to string in python

number_to_string and string_to_number must be edited in such a manner that the test functions all work

NOTE: You can not edit the test functions!!

The algorithm to compute the path to a particular pair of integers (m, n) is rather simple:

1. Begin with a pair of integers (m,n) and let S = ‘ ‘ be the empty string
2. If m < n set n to be n-m and add L on to the end of S (S↪SLS↪SL)
3. If m > n, set m to be m-n and add R on to the end of S (S↪SRS↪SR)
4. If m = n, the process stops and the path S is found
5. Until this happens, repeat step 2 or 3 depending on the condition