Write a toy scanf function. Its specification are as follows:

int toy_scanf( char format_str[], int *arg-1, float *arg-2, char arg-3[] )

The function has exactly four arguments with the constant string <format_str> being the format specifier. This string can have the following form: "<string-1>%d<string-2>%s<string-3>", or "<string-1>%f<string-2>%s<string-3>".

The function expects the input to be in the following form:
<string-1><a number><string-2><a string><string-3>
with <a number> being an integer if %d is present in <format_str>, and it being a float otherwise.

If the input is of correct form, the function reads the input number and string and stores them in *arg_1 and arg-2[] respectively, and returns 1. Otherwise it returns 0. The string in the input is terminated by a white-space (blank, tab, or new line).

Note: Only getchar() funcion can be used inside their definition. You should not use scanf! 

For example, for the call
toy_scanf("A number = %f\nA string = %s", &n, &s)
the first two inputs are in correct form and the next two are in the wrong form:
----------------------------------------------------------------------
A number = 30
A string =  This_is_a_string
---------------------------------------------------------------------
A number = 744.45
A string = Z
-------------------------------------------------------------------------
744.45
Z
-----------------------------------------------------------------------
A number = 744.45 A string = Z
-----------------------------------------------------------------------