Answer Happy

2. Write a function named “isBinaryString” that accepts a
C-string (an array of characters
with a NULL terminating character)and returns true
if that C-string contains a valid binary number and false
otherwise.
A valid binary string is defined as a string
that must contain only '0' and '1' with the optional 'b' or 'B' at
the end.
Please note that when 'b' or 'B' is at the end, it must precede
with at least a '0' or '1'.
For example, "1010" or "10b" will return true
"" or "b" or "b1" will return false.
The requirement is that you cannot use any string function such
as strlen or string class and its method.
This is an exercise on pointers and you are required to do the
check
by examining each character in the C-string using pointers.
This function works with C-string and not string class.
It also means that you should not pass the size of the string to
the function as a parameter.
Please use only pointer notation. Please do not use or refer the
string class in this function.
The following C-string will return true
char s0[] = {'0', '\0'} ;
char s1[] = {'1', '0', '\0'} ;
char s2[] = {'1', 'b', '\0'} ;
char s3[] = {'1', '0', '1', '0', '\0'} ;
char s4[] = {'1', '0', '1', '0', 'b', '\0'} ;
And the following C-string will return false
char s5[] = {'\0'} ;
char s6[] = {'b', '\0'} ;
char s7[] = {'1', 'b', '0', '\0'} ;
char s8[] = {'1', '0', '1', '2', '\0'} ;