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Need to do a function to process a division that can contain an infinite number of digits

The function definition:
char *exec_infin_div(char *operation, int ope_idx);

In this function, you have to process the result, and write it inside a dynamically allocated variable, and return it.
Careful about div by 0.
You must not free the received operation.

In the file sources/calculations/expr.c, I need to check if the - found is an actual operator or a sign in:

• find_next_operator()
• process_expr() ligne 40

Need to do a function to process an addition that can contain an infinite number of digits

The function definition:
char *exec_infin_add(char *operation, int ope_idx);

In this function, you have to process the result, and write it inside a dynamically allocated variable, and return it.
You must not free the received operation.

check_errors:

• check_allowed_chars()
• check_parenthesis()
• check_operators()
• global expressions with all sort of errors

parenthesis:

• handle_parenthesis()

expr:

• find_next_operator()
• process_expr()

utils:

• contains()
• contains_other_than()
• is_a_number()
• is_not_a_number()
• is_in()
• is_not_in()
• count_occurence()

Need to do a function to process a multiplication that can contain an infinite number of digits

The function definition:
char *exec_infin_mult(char *operation, int ope_idx);

In this function, you have to process the result, and write it inside a dynamically allocated variable, and return it.

You could call the exec_infin_add() function X times, where X is the lowest number of the operation ?

You must not free the received operation.

Need to do a function to process a subtraction that can contain an infinite number of digits

The function definition:
char *exec_infin_min(char *operation, int ope_idx);

In this function, you have to process the result, and write it inside a dynamically allocated variable, and return it.
You must not free the received operation.

Need to do a function to process a modulo that can contain an infinite number of digits

The function definition:
char *exec_infin_mod(char *operation, int ope_idx);

In this function, you have to process the result, and write it inside a dynamically allocated variable, and return it.
You must not free the received operation.

Just because it's better