fixed, but will require a reset of the sample tests by people who already tried the kata

replaced by a picture

fixed

Description does not mention that spaces in the input must be skipped.

Done

Random tests: char rand_string[rand_len] should be changed to char rand_string[rand_len + 1].

I also suggest to change the solution prototype to bool isPalindrome (const char *s) everywhere.

I cannot reproduce the failed test below on my local in js using node many versions or many browsers consoles with an instance of RegExp, the test is bogus:

Gentle fixed tests
100 fixed tests
"10" is not divisible by 7: expected true to equal false
Completed in 2ms

My tests:
true for
0: 0
false for
1: 1
false for
2: 10
false for
3: 11
false for
4: 100
false for
5: 101
false for
6: 110
true for
7: 111
false for
8: 1000
false for
9: 1001
false for
10: 1010
false for
11: 1011
false for
12: 1100
false for
13: 1101
true for
14: 1110
false for
15: 1111
false for
16: 10000
false for
17: 10001
false for
18: 10010
false for
19: 10011
false for
20: 10100
true for
21: 10101
false for
22: 10110
false for
23: 10111
false for
24: 11000
false for
25: 11001
false for
26: 11010
false for
27: 11011
true for
28: 11100
false for
29: 11101
false for
30: 11110
false for
31: 11111
false for
32: 100000
false for
33: 100001
false for
34: 100010
true for
35: 100011
false for
36: 100100
false for
37: 100101
false for
38: 100110
false for
39: 100111
false for
40: 101000
false for
41: 101001
true for
42: 101010
false for
43: 101011
false for
44: 101100
false for
45: 101101
false for
46: 101110
false for
47: 101111
false for
48: 110000
true for
49: 110001
false for
50: 110010
false for
51: 110011
false for
52: 110100
false for
53: 110101
false for
54: 110110
false for
55: 110111
true for
56: 111000
false for
57: 111001
false for
58: 111010
false for
59: 111011
false for
60: 111100
false for
61: 111101
false for
62: 111110
true for
63: 111111
false for
64: 1000000
false for
65: 1000001
false for
66: 1000010
false for
67: 1000011
false for
68: 1000100
false for
69: 1000101
....

Please review and approve my Haskell translation

Done

 * Regular expression implementation.
 * Supports only ( | ) * + ?.  No escapes.

This should be in description.

Approved. If possible, could you review my translation?

Approved. If possible, could you review my translation?

Please review and approve my C translation