infixTother v1.0 Released

1. One digit per terms
   It can convert a expression that ONLY contains ONE-DIGIT terms.
   For example :

   1+(2*3-(4/5^2)*7) is convertible.
   12 +( 21 *3-(4/ 54 ^2)*7) is not convertible.

2. Well-formed expressions
   For example :

   1+(2*3-(4/5^2)*7) is well-formed.
   *1+3/-3 is not well-formed.
   Please avoid negative number in the begining of expression.