0xwaleed / c-scratch

Essential programming tasks from scratch as a challenge and exercise. 🧩

c-scratch's Issues

RC4 algorithm implementation in C

RC4 Encryption

Description:

Write the RC4 algorithm to encrypt/decrypt data.

Details:

Header:

src/include/rc4.h

Source file:

src/rc4.c

Test file:

tests/rc4.test.cpp

Signature:

void rc4(const char* key, size_t keyLength, const char* plain, size_t plainLength, char* result);

Test Cases:

1. Input: key: "h" plain: "foo", output: result: "\xc7\x22\xc7"
2. Input: key: "secret" plain: "foo", output: result: "\x8b\x59\xbd"

Restriction:

• Do not use any builtin string functions.
• Only allowed to use memory functions ex: malloc, calloc, etc.

Note:

See Contribution Guide for more details.

Let me know if you are unable to write the tests, I will do that for you.

Also if you want any help let me know 😉.

Factorial Implementation.

Factorial

Description:

Write a simple factorial function.

Details:

Header:

src/include/factorial.h

Source file:

src/factorial.c

Test file:

tests/factorial.test.cpp

Signature:

uint64_t factorial(uint32_t number);

Restriction:

• Do not use any builtin string functions.
• Only allowed to use memory functions ex: malloc, calloc, etc.

Note:

See Contribution Guide for more details.

Let me know if you are unable to write the tests, I will do that for you.

Also if you want any help let me know 😉.

Find and Replace text in c

Find and Replace Text

Description:

We need to write a function to replace the first found occurrence

in the input with the given replacement text.

Details:

Header:

src/include/string_replace.h

Source file:

src/string_replace.c

Test file:

tests/string_replace.test.cpp

Signature:

char* string_replace_first_occurence(const char* text, const char* replacement, const char* input);

Restriction:

• Do not use any builtin string functions.
• Only allowed to use memory functions ex: malloc, calloc, etc.

Note:

See Contribution Guide for more details.

Let me know if you are unable to write the tests, I will do that for you.

Also if you want any help let me know 😉.