### Description
When doing base58 encoding and decoding there is some issue with the decoded
string.
Here is my code to ilustrate the issue :
$var(Test) = "test_string";
$var(Test) = $(var(Test){s.encode.base58});
xerr("Test String encoded = STRING_BEGIN$var(Test)STRING_END");
$var(Test) = $(var(Test){s.decode.base58});
xerr("Test String decoded = STRING_BEGIN$var(Test)STRING_END");
It has the following output :
I've inserted STRING_BEGIN and STRING_END in the log to be able to know when
string ends.
After this i've tried to user {s.trim} method with no success. I've noticed
that despite not printing correctly, the string's length is calculated
correctly, so i did a manual substring and was able to fix it.
xerr("Test Base58");
$var(Test) = "test_string";
$var(Test) = $(var(Test){s.encode.base58});
xerr("Test String encoded = STRING_BEGIN$var(Test)STRING_END");
$var(Test) = $(var(Test){s.decode.base58});
xerr("Test String decoded = STRING_BEGIN$var(Test)STRING_END");
$var(Test) = $(var(Test){s.trim});
xerr("Test String decoded and trimmed =
STRING_BEGIN$var(Test)STRING_END");
$var(substring_length) = $(var(Test){s.len}) - 1;
$var(Test) = $(var(Test){s.substr,0,$var(substring_length)});
xerr("Test String decoded and fixed =
STRING_BEGIN$var(Test)STRING_END");
Output :
All of this doesn't happen with method for base64 for example
### Additional Information
version: kamailio 5.7.1 (x86_64/linux) 4238e4
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC,
F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES,
TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024,
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 4238e4
compiled on 12:39:30 Jun 29 2023 with gcc 4.8.5
* **Operating System**:
CentOS 7
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https://github.com/kamailio/kamailio/issues/3907
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