Update app.py

Restrict input to C or F for the conversion

app.py

@@ -18,8 +18,10 @@ def celcius_tool(convertTo:str, temperature:int)-> str: #it's important to speci
     """
     if convertTo == "F":
         return f"Temperature {temperature} degrees in Fahrenheit is {(temperature * 1.8) + 32}"
-    else:
+    elif convertTo == "C":
         return f"Temperature {temperature} degrees in Celsius is {(temperature - 32) * 5/9}"
+    else:
+        return f"ERROR convertTo must be either C or F"
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: