Esta'dando o erro 404, mesmo com o repositório configurado para ter uma github page na pasta docs e nessa pasta estando o index.html gerado.

Esse é o link que deveria estar funcionando:
https://anders1232.github.io/SimpleCVariableSizeVector/

Code to reproduce the example: https://github.com/Anders1232/SimpleSocketProgram/tree/c3bf5329389772360e98217a28a879fa25817877

It happens on both vectors used on the code.

Valgrind output:
==4629== Invalid write of size 2
==4629== at 0x4C2F19B: memcpy@GLIBC_2.2.5 (vg_replace_strmem.c:1017)
==4629== by 0x400F11: VectorAppendCopy (vector.c:46)
==4629== by 0x401319: TcpServer (servidor.c:146)
==4629== by 0x401198: main (servidor.c:79)
==4629== Address 0x53f2b2c is 0 bytes after a block of size 60 alloc'd
==4629== at 0x4C2CDCF: realloc (vg_replace_malloc.c:785)
==4629== by 0x400E2C: Resize (vector.c:24)
==4629== by 0x400E97: VectorAllocateOne (vector.c:36)
==4629== by 0x400ED0: VectorAppendCopy (vector.c:44)
==4629== by 0x401319: TcpServer (servidor.c:146)
==4629== by 0x401198: main (servidor.c:79)
==4629==
==4629== Invalid write of size 8
==4629== at 0x4E3EBEF: pthread_create@@GLIBC_2.2.5 (pthread_create.c:631)
==4629== by 0x40135D: TcpServer (servidor.c:146)
==4629== by 0x401198: main (servidor.c:79)
==4629== Address 0x53f2b88 is 0 bytes after a block of size 24 alloc'd
==4629== at 0x4C2CDCF: realloc (vg_replace_malloc.c:785)
==4629== by 0x400E2C: Resize (vector.c:24)
==4629== by 0x400E97: VectorAllocateOne (vector.c:36)
==4629== by 0x401338: TcpServer (servidor.c:147)
==4629== by 0x401198: main (servidor.c:79)
==4629==
==4629== Thread 2:
==4629== Invalid read of size 8
==4629== at 0x4013FB: ConnectionEstabilished (servidor.c:163)
==4629== by 0x4E3E463: start_thread (pthread_create.c:333)
==4629== Address 0x53f2b2c is 0 bytes after a block of size 60 alloc'd
==4629== at 0x4C2CDCF: realloc (vg_replace_malloc.c:785)
==4629== by 0x400E2C: Resize (vector.c:24)
==4629== by 0x400E97: VectorAllocateOne (vector.c:36)
==4629== by 0x400ED0: VectorAppendCopy (vector.c:44)
==4629== by 0x401319: TcpServer (servidor.c:146)
==4629== by 0x401198: main (servidor.c:79)
==4629==
==4629== Invalid read of size 8
==4629== at 0x401402: ConnectionEstabilished (servidor.c:163)
==4629== by 0x4E3E463: start_thread (pthread_create.c:333)
==4629== Address 0x53f2b34 is 8 bytes after a block of size 60 alloc'd
==4629== at 0x4C2CDCF: realloc (vg_replace_malloc.c:785)
==4629== by 0x400E2C: Resize (vector.c:24)
==4629== by 0x400E97: VectorAllocateOne (vector.c:36)
==4629== by 0x400ED0: VectorAppendCopy (vector.c:44)
==4629== by 0x401319: TcpServer (servidor.c:146)
==4629== by 0x401198: main (servidor.c:79)
==4629==
==4629== Invalid read of size 4
==4629== at 0x40140A: ConnectionEstabilished (servidor.c:163)
==4629== by 0x4E3E463: start_thread (pthread_create.c:333)
==4629== Address 0x53f2b3c is 16 bytes after a block of size 60 alloc'd
==4629== at 0x4C2CDCF: realloc (vg_replace_malloc.c:785)
==4629== by 0x400E2C: Resize (vector.c:24)
==4629== by 0x400E97: VectorAllocateOne (vector.c:36)
==4629== by 0x400ED0: VectorAppendCopy (vector.c:44)
==4629== by 0x401319: TcpServer (servidor.c:146)
==4629== by 0x401198: main (servidor.c:79)
==4629==