Setup reading from csv, json and xml

[AdvaySanketi]

Closes #6

[bunsamosa-bot]

Thank you from Opening this Pull Request, @AdvaySanketi ! A Maintainer will review it soon!

[AdvaySanketi]

@AlaynaMonteiro Plz check out the PR

[AlaynaMonteiro]

  241 |     printf(*filename);
      |            ^~~~~~~~~
      |            |
      |            char
In file included from functions.c:1:
/usr/include/stdio.h:363:43: note: expected ‘const char * restrict’ but argument is of type ‘char’
  363 | extern int printf (const char *__restrict __format, ...);
      |                    ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
functions.c: In function ‘ReadFromFileJSON’:
functions.c:402:60: error: passing argument 3 of ‘parse_json_double_field’ from incompatible pointer type [-Wincompatible-pointer-types]
  402 |         parse_json_double_field(student_block, "\"sgpa\"", &stu[*n].sgpa);
      |                                                            ^~~~~~~~~~~~~
      |                                                            |
      |                                                            float *
functions.c:332:73: note: expected ‘double *’ but argument is of type ‘float *’
  332 | void parse_json_double_field(const char *json, const char *key, double *output) {
      |                                                                 ~~~~~~~~^~~~~~
functions.c: In function ‘ReadFromFileXML’:
functions.c:532:51: error: passing argument 3 of ‘parse_xml_double_field’ from incompatible pointer type [-Wincompatible-pointer-types]
  532 |             parse_xml_double_field(block, "sgpa", &stu[i].sgpa);
      |                                                   ^~~~~~~~~~~~
      |                                                   |
      |                                                   float *
functions.c:458:81: note: expected ‘double *’ but argument is of type ‘float *’
  458 | void parse_xml_double_field(const char *student_block, const char *tag, double *output) {

The code has a bunch of errors and hence does not run. Therefore, I have not given any points