I don't think this is an Issue, since the solution to any kata can be found on the Internet.

When kata authoring is done right, you have a unique problem. Neither the internet nor an AI will know what to do with your kata.

why?

at the end of your for loop, what value does j have ? is it the correct index to nul terminate ? also, notice the warnings:

memset(assembled, '\0', sizeof(assembled));
       ~~~~~~~~~               ^~~~~~~~~
/*
solution.c:9:34:

warning: 'memset' call operates on objects of type 'char' while the size is based on a different type 'char *' [-Wsizeof-pointer-memaccess]
note: did you mean to provide an explicit length?
*/

😂😂😅

(c#): IMHO the example test has still the typo:
Assert.AreEqual("abcde", Kata.Assemble(new string[] {"abcde","abcde","abcbe"}));

c# tests give growing input? every next test is previous+newtest. last test already has 200 lines (all previous lines together)

[Y
yY
ysY
ysY
y*[*

[Y
yY
ysY
ysY
y*[*
PdqTq
PdqTq
dqTq
PqTq
Pdq**

[Y
yY
ysY
ysY
y*[*
PdqTq
PdqTq
dqTq
PqTq
Pdq**
9Mccp
9McWTcp
MWJTcp
9MWJ*p
9McJTp

[Y
yY
ysY
ysY
y*[*
PdqTq
PdqTq
dqTq
PqTq
Pdq**
9Mccp
9McWTcp
MWJTcp
9MWJ*p
9McJTp
2XNs
*2X's
DX'*s
D2X's
D2'Ns

etc.

Approved

Approved

Approved

Can't to approve due to a conflict in the description.
Forks with the correct description for COBOL and Go.

Approved

COBOL Approved

Approved

Approved