Postfix to Prefix Conversion

Given a postfix expression, convert it to its equivalent prefix expression. A postfix expression is an expression in which operators follow their operands. For example, ab+ means a + b. A prefix expression is an expression in which operators precede their operands. For example, +ab means a + b. The expression will consist of single lowercase English letters as operands and standard binary operators: +, , , /. Input Specification: The input will be a single string representing the postfix expression. Output Specification: Return a single string representing the equivalent prefix expression. Constraints: The input string will be a valid postfix expression. The length of the expression will be between 1 and 1000 characters. Operands are single lowercase English letters ('a' 'z'). Operators are +, , , /. Sample Input 1: ab+cd Sample Output 1: +ab cd Explanation for Sample 1: 1. ab+ converts to +ab 2. cd converts to cd 3. The expression becomes +ab cd (conceptually), which converts to +ab cd in prefix form.