Add wiki/strlen.md

wiki/strlen.md

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+# STRLEN
+Strlen (string length) is a function that takes an chars list as a parameter and return an length (like strlen in C)
+
+## params
+1. char list
+
+## return
+number
+
+## example
+```
+strlen("ab") => 2
+strlen(NULL) => 0
+strlen("") => 0
+strlen("j'ai les cramptés") => 17
+```