user: I need to calculate the sum of the binary numbers '10011' and '1100'. Could you help me with that?

Available functions:
name: add_binary_numbers
description: Adds two binary numbers.
parameters: type: dict
properties: a: type: string
description: The first binary number.
b: type: string
description: The second binary number.
required: a
b
name: convert_binary_to_decimal
description: Converts a binary number to a decimal number.
parameters: type: dict
properties: binary: type: string
description: The binary number to convert.
required: binary
name: convert_decimal_to_hex
description: Converts a decimal number to a hexadecimal number.
parameters: type: dict
properties: decimal: type: integer
description: The decimal number to convert.
required: decimal

Ground truth function call(s):
add_binary_numbers(a='10011',b='1100')