Update data_structures/stacks/infix_to_postfix_conversion.py

Co-authored-by: Tianyi Zheng <tianyizheng02@gmail.com>

data_structures/stacks/infix_to_postfix_conversion.py

@@ -88,13 +88,13 @@ def infix_to_postfix(expression_str: str) -> str:
                 if char_precedence > tos_precedence:
                     stack.push(char)
                     break
-                elif char_precedence == tos_precedence:
+                if char_precedence < tos_precedence:
+                    postfix.append(stack.pop())
+                    continue
+                # Precedences are equal
                 if associativity(char) == "RL":
                     stack.push(char)
                     break
-                    else:
-                        postfix.append(stack.pop())
-                else:
                 postfix.append(stack.pop())
 
     while not stack.is_empty():