University of San Francisco Base Conversion Tool Using Command Line Project

I’m working on a Computer Science exercise and need support.

1. Implement a base conversion tool called nt. It converts numbers expressed in bases 2, 10, and 16 into the other two bases.
2. use command line arguments in C
3. You must implement the base conversions yourself, without using C library printf(), scanf(), or atoi()
5. Examples:

$ ./nt 10 -o 2

0b1010

$ ./nt 0xFF -o 10

255

$ ./nt 0b11011110101011011011111011101111 -o 16

0xDEADBEEF
$ ./nt 0b11111111111111111111111111111111 -o 10
4294967295
$ ./nt 0x0000000B -o 10
11
$ ./nt 0b123 -o 2
Bad input

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1. Pseudocode: uint32_t string_to_int(char *str);
   init retval to 0
   init placeval to 1 (anything to the 0 power is 1)
   loop over str from the highest index down to 0
   calculate the integer corresponding to the character at that index
   calculate the value of that place by multiplying the integer * placeval
   add the value to the retval
   update to placeval to placeval * base
   return the return value
2. Pseudocode: void int_to_string(uint32_t value, char *str, int base);
   init buffer to empty
   while value != 0
   quot = value / base
   rem = value % base
   calculate the character value of rem
   append the character value to the buffer
   value = quot
   copy buffer into str in reverse order