You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "calculate_factorial", "description": "Calculates the factorial of a non-negative integer.", "parameters": {"n": {"description": "The non-negative integer.", "type": "int"}}}, {"name": "find_first_non_repeating_char", "description": "Finds the first non-repeating character in a string.", "parameters": {"s": {"description": "The input string.", "type": "str"}}}, {"name": "is_armstrong_number", "description": "Checks if a number is an Armstrong number.", "parameters": {"num": {"description": "The number to check.", "type": "int"}}}, {"name": "is_rotation", "description": "Checks if one string is a rotation of another string.", "parameters": {"str1": {"description": "The first string.", "type": "str"}, "str2": {"description": "The second string.", "type": "str"}}}]
Find the first non-repeating character in the string 'aabbc' and check if 'waterbottle' is a rotation of 'erbottlewat'.
user
assistant
[{"name": "find_first_non_repeating_char", "arguments": {"s": "aabbc"}}, {"name": "is_rotation", "arguments": {"str1": "waterbottle", "str2": "erbottlewat"}}]